APA

Proctor M., Lack A. & Yeo P. (1996). The Natural history of pollination. Londres: Harper Collins Publishers.

Chicago

Proctor Michael, Lack Andrew and Yeo Peter. 1996. The Natural history of pollination. Londres: Harper Collins Publishers.

Harvard

Proctor M., Lack A. and Yeo P. (1996). The Natural history of pollination. Londres: Harper Collins Publishers.

MLA

Proctor Michael, Lack Andrew and Yeo Peter. The Natural history of pollination. Londres: Harper Collins Publishers. 1996.