APA (7th ed.) Citation

Gill, N. T., Vear, K. C., & Barnard, D. J. (1980). Agricultural botany (3d ed. rev.). Duckworth.

Chicago Style (17th ed.) Citation

Gill, N. T., K. C. Vear, and D. J. Barnard. Agricultural Botany. 3d ed. rev. London: Duckworth, 1980.

MLA (9th ed.) Citation

Gill, N. T., et al. Agricultural Botany. 3d ed. rev. Duckworth, 1980.