Παραπομπή APA

Harr, M. E. (1962). Ground water and seepage. Mc Graw Hill Book company.

Παραπομπή Chicago Style

Harr, M E. Ground Water and Seepage. NewYork: Mc Graw Hill Book company, 1962.

Παραπομπή MLA

Harr, M E. Ground Water and Seepage. Mc Graw Hill Book company, 1962.