Παραπομπή APA

Stewart, W. D. P. (1975). Nitrogen fixation by free- living micro organisms. Cambridge University Press.

Παραπομπή Chicago Style

Stewart, W. D. P. Nitrogen Fixation by Free- Living Micro Organisms. London: Cambridge University Press, 1975.

Παραπομπή MLA

Stewart, W. D. P. Nitrogen Fixation by Free- Living Micro Organisms. Cambridge University Press, 1975.