APA (7th ed.) Zitazioa

Tuckman, B. W. Identifying and labeling variables.

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

Tuckman, Bruce W. Identifying and Labeling Variables.