Wagar, J. A. (1972). The recording quizboard: A device for evaluating interpretive services. Pacific Northwest Forest and Range Experiment Station, USDA Forest Service.
Chicago-Zitierstil (17. Ausg.)Wagar, J. Alan. The Recording Quizboard: A Device for Evaluating Interpretive Services. Portland, Or: Pacific Northwest Forest and Range Experiment Station, USDA Forest Service, 1972.
MLA-Zitierstil (9. Ausg.)Wagar, J. Alan. The Recording Quizboard: A Device for Evaluating Interpretive Services. Pacific Northwest Forest and Range Experiment Station, USDA Forest Service, 1972.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.