APA استشهاد

Butler, D. (2001). nature yearbook of science and technology 2001. Nature Publishing Group.

استشهاد بنمط شيكاغو

Butler, Declan. Nature Yearbook of Science and Technology 2001. London: Nature Publishing Group, 2001.

MLA استشهاد

Butler, Declan. Nature Yearbook of Science and Technology 2001. Nature Publishing Group, 2001.