APA-Zitierstil (7. Ausg.)

Engel, B. S. (1977). Informal evaluation. North Dakota Study Group on Evaluation, University of North Dakota.

Chicago-Zitierstil (17. Ausg.)

Engel, Brenda S. Informal Evaluation. Grand Forks, N.D: North Dakota Study Group on Evaluation, University of North Dakota, 1977.

MLA-Zitierstil (9. Ausg.)

Engel, Brenda S. Informal Evaluation. North Dakota Study Group on Evaluation, University of North Dakota, 1977.