APA

Anderson E. F., Walkington D. L., . (1970). New combinations and taxa in the Cactaceae of the Galápagos Islands. : .

Chicago

Anderson Edward F, Walkington David L, . 1970. New combinations and taxa in the Cactaceae of the Galápagos Islands. : .

Harvard

Anderson E. F., Walkington D. L., . (1970). New combinations and taxa in the Cactaceae of the Galápagos Islands. : .

MLA

Anderson Edward F, Walkington David L, . New combinations and taxa in the Cactaceae of the Galápagos Islands. : . 1970.