Citazione APA

Willis, J. C. (1966). Dictionary of the flowering plants and ferns (7.). At tbe University Press.

Stile di citazione Chicago

Willis, J C. Dictionary of the Flowering Plants and Ferns. 7. Cambridge: At tbe University Press, 1966.

Citazione MLA

Willis, J C. Dictionary of the Flowering Plants and Ferns. 7. At tbe University Press, 1966.