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 PB-PH : Modern European languages. Gale Research Inc.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States. Library of Congress, Helen Savage, Kathleen D. Droste, और Rita Runshock. Library of Congress Classification Schedules Combined with Additions and Changes Through 1986 Class P : Philology and Literature: Subclass PB-PH : Modern European Languages. Detroit: Gale Research Inc, 1987.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUnited States. Library of Congress, et al. Library of Congress Classification Schedules Combined with Additions and Changes Through 1986 Class P : Philology and Literature: Subclass PB-PH : Modern European Languages. Gale Research Inc, 1987.