APA (7th ed.) Citation

Gill, N. T., & Vear, K. C. (1966). Agricultural botany (2nd ed.). G. Duckworth.

Chicago Style (17th ed.) Citation

Gill, N. T., and K. C. Vear. Agricultural Botany. 2nd ed. London: G. Duckworth, 1966.

MLA (9th ed.) Citation

Gill, N. T., and K. C. Vear. Agricultural Botany. 2nd ed. G. Duckworth, 1966.