APA

Simmons J. B., Beyer R. I., Brandham P. E., Lucas G. L. & Parry V. T. H. (1976). Conservation of threatened plants. New York, United States: Plenum.

Chicago

Simmons J B, Beyer R I, Brandham P E, Lucas G Ll and Parry V T H. 1976. Conservation of threatened plants. New York, United States: Plenum.

Harvard

Simmons J. B., Beyer R. I., Brandham P. E., Lucas G. L. and Parry V. T. H. (1976). Conservation of threatened plants. New York, United States: Plenum.

MLA

Simmons J B, Beyer R I, Brandham P E, Lucas G Ll and Parry V T H. Conservation of threatened plants. New York, United States: Plenum. 1976.