APA

Willis J. C., Shaw H. K. A., . (1966). A dictionary of the flowering plants and ferns. Cambridge: Cambridge University Press.

Chicago

Willis John Christopher, Shaw Herbert Kenneth Airy, . 1966. A dictionary of the flowering plants and ferns. Cambridge: Cambridge University Press.

Harvard

Willis J. C., Shaw H. K. A., . (1966). A dictionary of the flowering plants and ferns. Cambridge: Cambridge University Press.

MLA

Willis John Christopher, Shaw Herbert Kenneth Airy, . A dictionary of the flowering plants and ferns. Cambridge: Cambridge University Press. 1966.