Harper, D., Wooff, C., & Hodgkinson, D. [ca. 1991]. A guide to computer algebra systems. In Wiley professional computing [Book]. Chichester [u.a.]: Wiley.

HARPER, David, WOOFF, Chris und HODGKINSON, David, 1991. A guide to computer algebra systems. Chichester [u.a.]: Wiley. ISBN 0471929107.

Harper, D., C. Wooff, und D. Hodgkinson. „A guide to computer algebra systems“. Wiley professional computing, book, Wiley, 1991.

Harper, David/Wooff, Chris/Hodgkinson, David: A guide to computer algebra systems, Chichester [u.a.] 1991.

Harper, D., Wooff, C. und Hodgkinson, D. (1991), A guide to computer algebra systems, Wiley professional computing, Bd. , Wiley, Chichester [u.a.].