Primary Sources:
Havriil Pichura (Guy de Picarda), "The Podobny Chants of the Suprasl Irmologion of 1601," The Journal of Byelorussian Studies, Vol. 2, No. 2 (1970), pp. 192-221 (196).
Dol'nyts'kyj, Hlasopisnec
Bokshai & Malinich, Prostopinije
Manasij Todorov, Psaltikien V"zkresnik Osmoglasnik, 2nd ed. (Sofia: Sinodalno Izdatelstvo, 1968). This is a Sunday Octoechos, but after the Octoechos section there is a Podobnik with numerous automela in neumatic notation.
Collections:
The forthcoming collection by Walter Obleshchuk will, I understand, be more complete than previous ones. (The current status of his work is unknown, and we await further news.)
Tatiana Popov, in her annotated "Podobnik" (Book of Special Melodies), has provided some marvellous bibliographical materials and mentions several podobniki unknown to most people.
Nicholas Trepatschko has published a collection of special melodies ("Podobens - the Lost Pearl of the Russian Orthodox Church") with Slavonic text in four-part settings. It includes an impressive number of stichera (no troparia or exapostilaria), and provides the versions of the Znamenny and Kiev chants and the chants of the Valaam and Optina monasteries. In all, 65 versions are given. The book is available for $28 plus $3 S&H (domestic rate) from Nick Trepatschko, 39 Redhill Drive, Stafford, VA 22554. (Unfortunately, the Liturgical Music Commission of the Russian Orthodox Church Outside of Russia does not recommend its use in their parishes; there seem to be problems with the documentation and presentation of materials which will require further investigation.) To purchase this book, you may e-mail Nick personally at NICKTREP@AOL.COM or visit his home-Church website at http://dormitionchurch.homestead.com.
Fr. Stephan Meholik, rector of St. Nicholas Orthodox Church in San Anselmo, CA, is a good source for Galician Special Melodies, as well as melodies from other traditions.
Solovetskii Obikhod
(1912) - the sources of these melodies have not been identified yet (awaiting
analysis)
Bulgarian Byzantine
Chant Podobny - found in "Tsrkovno-Pevcheski sbornik, chast
vtora, Obshiren Vzkresnik", edited by Petr Dinev; Sofiia, Bulgaria,
Sinodalno Knigoizdatelstvo, 1949. (Scanned from old photocopies of poor
quality, enhanced in Photoshop, but the words are still hard to read for
those not already familiar with the Slavonic text.) This collection contains
melodies for all three categories of Podoben melodies.
Links:
Подобны распева Киево-Печерской Лавры - These are modern simplified choral arrangements of Kiev Caves melodies for Podobny. (Some of the melodies have also been simplified.)
St. Raphael Press - Orthodox Traditional Chant - Various Podobny from different traditions.
ПОДОБНЫ старинных монастырских напевов. (Item number 32 in the catalog, in the link does not direct you there.) Podobny starinnyh monastyrskih napevov. Dlja odnorodnogo hora. Sostavitel' arhimandrit Matfej (Mormyl'). Moskva: Zhivonosnyj Istochnik. 1999. 33 pages. This is a collection of Podobny melodies from the local monastic traditions of Optina, Glinsk, Kiev Caves, Seven Lakes and Trinity-Sergius Lavra. The melody sources are given in the publication: some have been notated from oral tradition of the mentioned monasteries in the 1960s and 70s, while others have been extracted from various unspecified manuscripts. The selections from this book are available online at: Мужской хор Свято-Покровского монастыря г. Харькова
Podoben web site (Protodeacon Stephen Howanetz)
Studies:
Ivan A. Gardner, "Zabytoe bogatstvo (o penii na podoben)" [Forgotten Treasure (concerning the singing of the automelon)], Voskresnoe chtenie (Warsaw), 1930, and published separately, 32 pp. - Commentary by Stephen Reynolds