Citazione Stile APA (7a Edizione)

WALKER, H. M. (1951). Mathematics essential for elementary: Statistics; a self-teaching manual. Holt, Rinehart and Winston.

Citazione stile Chigago Style (17a edizione)

WALKER, Helen M. Mathematics Essential for Elementary: Statistics; a Self-teaching Manual. New York: Holt, Rinehart and Winston, 1951.

Citatione MLA (9a ed.)

WALKER, Helen M. Mathematics Essential for Elementary: Statistics; a Self-teaching Manual. Holt, Rinehart and Winston, 1951.