Magometov, Alexander. The Agul Language (Agul'skii iazyk), 1970. In Russian.

Магометов, Александр Ахмедович. Агульский язык: Исследование и тексты.
Тбилиси: Мецниереба, 1970.
242 с. Твёрдый переплёт, обычный формат. Тираж: 1 000 экз.
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Magometov, Alexander Akhmedovich. The Agul Language: Research and Texts (Agul'skii iazyk).
Tbilisi: Metsniereba, 1970.
242 pp. Hardcover, standard format. Print run: 1,000 copies.

This 1970 monograph is a definitive scholarly resource on the Agul language, a member of the Lezgic branch of the Northeast Caucasian (Nakh-Dagestanian) language family. At the time of publication, Agul was a purely oral, unwritten language spoken in the high-altitude Agulsky District of southern Dagestan.
Alexander Magometov, a titan of Caucasian linguistics, provides a comprehensive structural analysis of the language's four primary dialects: Agul proper, Koshan, Keren, and Burkikhan. The work is particularly esteemed for its treatment of Agul's formidable phonological system and its complex ergative-absolute alignment. Magometov’s research was instrumental in documenting the language's unique morphological traits, such as its exceptionally rich case system.
The volume includes a selection of transcribed folklore texts—tales, songs, and ethnographic sketches—which serve as a vital record of the Agul cultural and linguistic heritage. With a limited print run of only 1,000 copies, this "Metsniereba" edition is a rare and essential acquisition for specialists in linguistic typology and the languages of the Caucasus.