Cita APA (7a ed.)

Kellerman, A. (1981). Centrographic measures in geography. Geo Abstracts.

Cita Chicago Style (17a ed.)

Kellerman, Aharon. Centrographic Measures in Geography. Norwich: Geo Abstracts, 1981.

Cita MLA (9a ed.)

Kellerman, Aharon. Centrographic Measures in Geography. Geo Abstracts, 1981.