APA Citation

Cullmann, W. 1., Gotz, E. 1., Groner, G. 1., & Thomas, K. M. (1987). The encyclopedia of cacti. Portland, Oregon: Timber Press.

Chicago Style Citation

Cullmann, Willy 1905-1992, Erich 1940- Gotz, Gerhard 1933- Groner, and Keith M. Thomas. The Encyclopedia of Cacti. Portland, Oregon: Timber Press, 1987.

MLA Citation

Cullmann, Willy 1905-1992, Erich 1940- Gotz, Gerhard 1933- Groner, and Keith M. Thomas. The Encyclopedia of Cacti. Portland, Oregon: Timber Press, 1987.

Warning: These citations may not always be 100% accurate.