APA (7th ed.) Citation

Dickey, D. R., & Van Rossem, A. J. (1938). The birds of El Salvador. [publisher not identified].

Chicago Style (17th ed.) Citation

Dickey, Donald R., and A. J. Van Rossem. The Birds of El Salvador. [Chicago]: [publisher not identified], 1938.

MLA (9th ed.) Citation

Dickey, Donald R., and A. J. Van Rossem. The Birds of El Salvador. [publisher not identified], 1938.