Cita APA (7a ed.)

Rugh, A. G. (1975). Toward a Science of Reference Work: Basic Concepts.

Cita Chicago Style (17a ed.)

Rugh, Archie G. Toward a Science of Reference Work: Basic Concepts. 1975.

Cita MLA (9a ed.)

Rugh, Archie G. Toward a Science of Reference Work: Basic Concepts. 1975.