Παραπομπή APA

Bywater, F. V. (1969). Proficiency course in English. University of London P..

Παραπομπή Chicago Style

Bywater, Frank Vivian. Proficiency Course in English. London: University of London P., 1969.

Παραπομπή MLA

Bywater, Frank Vivian. Proficiency Course in English. University of London P., 1969.