Cita APA (7a ed.)

Smith, N. G. (1950). Organic surface cultivation: Its theory and practice. Ward Lock.

Cita Chicago Style (17a ed.)

Smith, N. Gerard. Organic Surface Cultivation: Its Theory and Practice. London: Ward Lock, 1950.

Cita MLA (8a ed.)

Smith, N. Gerard. Organic Surface Cultivation: Its Theory and Practice. Ward Lock, 1950.