Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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