Παραπομπή APA

Jepersen, O. . .. (1974). Essential of english grammar. George Allen & Unwin Ltd.

Παραπομπή Chicago Style

Jepersen, Ottto. Essential of English Grammar. London: George Allen & Unwin Ltd, 1974.

Παραπομπή MLA

Jepersen, Ottto. Essential of English Grammar. George Allen & Unwin Ltd, 1974.