APA (7th ed.) Citation

Metropolitan Museum of Art (New York, N.Y.). Library, Pennell, E. A., & Wallace, L. E. (1911). Classification systems used in the Library: Photograph classification. [The Gilliss press].

Chicago Style (17th ed.) Citation

Metropolitan Museum of Art (New York, N.Y.). Library, Ethel A. Pennell, and Lucie E. Wallace. Classification Systems Used in the Library: Photograph Classification. New York: [The Gilliss press], 1911.

MLA (9th ed.) Citation

Metropolitan Museum of Art (New York, N.Y.). Library, et al. Classification Systems Used in the Library: Photograph Classification. [The Gilliss press], 1911.