Cita APA (7th ed.)

WALKER, H. M. (1969). Elementary statistical methods. Holt, Rinehart and Winston.

Cita Chicago (17th ed.)

WALKER, Helen M. Elementary Statistical Methods. New York: Holt, Rinehart and Winston, 1969.

Cita MLA (9th ed.)

WALKER, Helen M. Elementary Statistical Methods. Holt, Rinehart and Winston, 1969.