United States. Library of Congress, Savage, H., Droste, K. D., & Runshock, R. (1987). Library of Congress classification schedules combined with additions and changes through 1986 Class P : Philology and literature: Subclass PJ-PM : Languages and literatures of Asia, Africa, Oceania, America, Mixed languages, Artificial languages. Gale Research Inc.

United States. Library of Congress, Helen Savage, Kathleen D. Droste, and Rita Runshock. Library of Congress Classification Schedules Combined with Additions and Changes Through 1986 Class P : Philology and Literature: Subclass PJ-PM : Languages and Literatures of Asia, Africa, Oceania, America, Mixed Languages, Artificial Languages. Detroit: Gale Research Inc, 1987.

United States. Library of Congress, et al. Library of Congress Classification Schedules Combined with Additions and Changes Through 1986 Class P : Philology and Literature: Subclass PJ-PM : Languages and Literatures of Asia, Africa, Oceania, America, Mixed Languages, Artificial Languages. Gale Research Inc, 1987.