APA

Benson L., Hamilton L. B., . (1982). The cacti of United States and Canada. Stanford, California: Stanford University Press.

Chicago

Benson Lyman, Hamilton Lucretia Breazeale, . 1982. The cacti of United States and Canada. Stanford, California: Stanford University Press.

Harvard

Benson L., Hamilton L. B., . (1982). The cacti of United States and Canada. Stanford, California: Stanford University Press.

MLA

Benson Lyman, Hamilton Lucretia Breazeale, . The cacti of United States and Canada. Stanford, California: Stanford University Press. 1982.