Παραπομπή σε μορφή APA (7η εκδ.)

Kreveld, D. v. (1970). Structure and outcomes of study groups: A method of determining several properties of group structure and some relationships observed with group outcomes. Van Gorcum.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Kreveld, David van. Structure and Outcomes of Study Groups: A Method of Determining Several Properties of Group Structure and Some Relationships Observed with Group Outcomes. Assen: Van Gorcum, 1970.

Παραπομπή σε μορφή MLA (8th εκδ.)

Kreveld, David van. Structure and Outcomes of Study Groups: A Method of Determining Several Properties of Group Structure and Some Relationships Observed with Group Outcomes. Van Gorcum, 1970.