Παραπομπή APA

Sprent, J. I., & Sprent, P. (1990). Nitrogen fixing organisms: Pure and Applied Aspects. Chapman and Hall.

Παραπομπή Chicago Style

Sprent, Janet I., και Peter Sprent. Nitrogen Fixing Organisms: Pure and Applied Aspects. London ; New York: Chapman and Hall, 1990.

Παραπομπή MLA

Sprent, Janet I., και Peter Sprent. Nitrogen Fixing Organisms: Pure and Applied Aspects. Chapman and Hall, 1990.