Hailperin, M., Kaiser, B., & Knight, K. (1999). Concrete abstractions: An introduction to computer science using scheme. Pacific Grove: Brooks/Cole.
استشهاد بنمط شيكاغوHailperin, Max., Barbara Kaiser, و Karl Knight. Concrete Abstractions: An Introduction to Computer Science Using Scheme. Pacific Grove: Brooks/Cole, 1999.
MLA استشهادHailperin, Max., Barbara Kaiser, و Karl Knight. Concrete Abstractions: An Introduction to Computer Science Using Scheme. Pacific Grove: Brooks/Cole, 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.