Cita APA (7a ed.)

Gillmor, D., & Drew, D. (1977). Physical geography. Gill and Macmillan.

Cita Chicago Style (17a ed.)

Gillmor, Desmond, y David Drew. Physical Geography. Dublin: Gill and Macmillan, 1977.

Cita MLA (9a ed.)

Gillmor, Desmond, y David Drew. Physical Geography. Gill and Macmillan, 1977.