Lua APA (7ú heag.)

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.

Lua i Stíl Chicago (17ú heag.)

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.

Lua MLA (8ú heag.)

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.

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