Peterson's Guides, Inc, & University Continuing Education Association. (1997). Peterson's distance learning programs (2nd ed.). Peterson's.
Chicago (17e ed.) BronvermeldingPeterson's Guides, Inc, en University Continuing Education Association. Peterson's Distance Learning Programs. 2nd ed. Princeton, N.J: Peterson's, 1997.
MLA (9e ed.) BronvermeldingPeterson's Guides, Inc, en University Continuing Education Association. Peterson's Distance Learning Programs. 2nd ed. Peterson's, 1997.
Let op: Deze citaties zijn niet altijd 100% accuraat.