APA

Abbe E., Clausen R. T., . (1975). Sedum of North America north of the mexican plateau. Ithaca: Cornell University Press.

Chicago

Abbe Elfriede, Clausen Robert Theodore, . 1975. Sedum of North America north of the mexican plateau. Ithaca: Cornell University Press.

Harvard

Abbe E., Clausen R. T., . (1975). Sedum of North America north of the mexican plateau. Ithaca: Cornell University Press.

MLA

Abbe Elfriede, Clausen Robert Theodore, . Sedum of North America north of the mexican plateau. Ithaca: Cornell University Press. 1975.