Cita APA (7a ed.)

Ritchie, J. C. (1984). Past and Present Vegetation of the Far Northwest of Canada. University of Toronto Press.

Cita Chicago Style (17a ed.)

Ritchie, J. C. Past and Present Vegetation of the Far Northwest of Canada. Buffalo: University of Toronto Press, 1984.

Cita MLA (8a ed.)

Ritchie, J. C. Past and Present Vegetation of the Far Northwest of Canada. University of Toronto Press, 1984.