Cita APA (7a ed.)

Harper, J. L. (1960). The Biology of weeds: A symposium of the British ecological society. Blackwell.

Cita Chicago Style (17a ed.)

Harper, John L. The Biology of Weeds: A Symposium of the British Ecological Society. Oxford: Blackwell, 1960.

Cita MLA (8a ed.)

Harper, John L. The Biology of Weeds: A Symposium of the British Ecological Society. Blackwell, 1960.