Cita APA (7a ed.)

Catalan, G. I. (1980). Earthworm raising: A gold mine. s.n.].

Cita Chicago Style (17a ed.)

Catalan, Gabriel Isada. Earthworm Raising: A Gold Mine. [S.l: s.n.], 1980.

Cita MLA (9a ed.)

Catalan, Gabriel Isada. Earthworm Raising: A Gold Mine. s.n.], 1980.