Cita APA (7th ed.)

Blake, F. (1990). Organic farming and growing (2a. ed.). The Crowood.

Cita Chicago (17th ed.)

Blake, Francis. Organic Farming and Growing. 2a. ed. Londres: The Crowood, 1990.

Cita MLA (9th ed.)

Blake, Francis. Organic Farming and Growing. 2a. ed. The Crowood, 1990.