Παραπομπή APA

Walker, H. M., & Lev, J. (1958). Elementary statistical methods. Oxford and IBH.

Παραπομπή Chicago Style

Walker, Helen M., και Joseph Lev. Elementary Statistical Methods. New Delhi: Oxford and IBH, 1958.

Παραπομπή MLA

Walker, Helen M., και Joseph Lev. Elementary Statistical Methods. Oxford and IBH, 1958.