Tohutoro APA (7th ed.)

Tuckman, B. W. Identifying and labeling variables.

Tohutoru Kātū Chicago (17th ed.)

Tuckman, Bruce W. Identifying and Labeling Variables. [Lugar de publicación no identificado].

Tohutoro MLA (9th ed.)

Tuckman, Bruce W. Identifying and Labeling Variables.