Cita APA (7a ed.)

Knapp, B., & Mac Crae, D. (1986). Systematic geography. Allen & Unwin.

Cita Chicago Style (17a ed.)

Knapp, Brian, y Duncan Mac Crae. Systematic Geography. London [etc.]: Allen & Unwin, 1986.

Cita MLA (9a ed.)

Knapp, Brian, y Duncan Mac Crae. Systematic Geography. Allen & Unwin, 1986.