APA (7th ed.) Citation

Black, P. M., Rittershausen, W., & Black, P. (1992). The Ward Lock book of orchid growing (2nd ed.). Ward Lock.

Chicago Style (17th ed.) Citation

Black, Peter McKenzie, Wilma Rittershausen, and Peter Black. The Ward Lock Book of Orchid Growing. 2nd ed. London: Ward Lock, 1992.

MLA (9th ed.) Citation

Black, Peter McKenzie, et al. The Ward Lock Book of Orchid Growing. 2nd ed. Ward Lock, 1992.