Παραπομπή APA

Sprent, J. I. (1979). Biology of nitrogen - fixing organisms. Mc Graw Hill Book company.

Παραπομπή Chicago Style

Sprent, J I. Biology of Nitrogen - Fixing Organisms. NewYork: Mc Graw Hill Book company, 1979.

Παραπομπή MLA

Sprent, J I. Biology of Nitrogen - Fixing Organisms. Mc Graw Hill Book company, 1979.