Essential English vocabulary. Workbook for the 3,000 most frequent words (2de herz. uitg.).

MLA

De Herdt, J, and Didier L Goyvaerts. Essential English Vocabulary. Workbook for the 3,000 Most Frequent Words (2de Herz. Uitg.). Gent, 1969.

APA

De Herdt, J., & Goyvaerts, D. L. (1969). Essential English vocabulary. Workbook for the 3,000 most frequent words (2de herz. uitg.). Gent.

Chicago

De Herdt, J., and Didier L Goyvaerts. Essential English Vocabulary. Workbook for the 3,000 Most Frequent Words (2de Herz. Uitg.). Gent, 1969.