Cita APA (7a ed.)

Heaton, J., & Stocks, J. (1977). Overseas students' companion to English studies. Longman.

Cita Chicago Style (17a ed.)

Heaton, J.B, y J.P Stocks. Overseas Students' Companion to English Studies. London: Longman, 1977.

Cita MLA (9a ed.)

Heaton, J.B, y J.P Stocks. Overseas Students' Companion to English Studies. Longman, 1977.