APA

Friis E. M., . (2011). Early flowers and angiosperm evolution. New York: Cambridge University Press.

Chicago

Friis Else Marie, . 2011. Early flowers and angiosperm evolution. New York: Cambridge University Press.

Harvard

Friis E. M., . (2011). Early flowers and angiosperm evolution. New York: Cambridge University Press.

MLA

Friis Else Marie, . Early flowers and angiosperm evolution. New York: Cambridge University Press. 2011.