APA ציטוט

Billings, W. D. (1964). Plants and the ecosystem. London: MacMillan and Co., Ltd.

Trích dẫn kiểu Chicago

Billings, W. D. Plants and the Ecosystem. London: MacMillan and Co., Ltd, 1964.

ציטוט MLA

Billings, W. D. Plants and the Ecosystem. London: MacMillan and Co., Ltd, 1964.