Perschbacher,Ruth. (1993). Assesment: The Cornerstone of activity programs. State College: Venture Publishing.
استشهاد بنمط شيكاغوPerschbacher,Ruth. Assesment: The Cornerstone of Activity Programs. State College: Venture Publishing, 1993.
MLA استشهادPerschbacher,Ruth. Assesment: The Cornerstone of Activity Programs. State College: Venture Publishing, 1993.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.