Cita APA (7a ed.)

Crichton, J. S. (1968). Blackboard drawing for geography. Nelson.

Cita Chicago Style (17a ed.)

Crichton, J. Stewart. Blackboard Drawing for Geography. London: Nelson, 1968.

Cita MLA (8a ed.)

Crichton, J. Stewart. Blackboard Drawing for Geography. Nelson, 1968.