APA (7th ed.) Citation

Close, R. A. (1981). English as a foreign language: Its constant grammatical problems (3rd ed.). Allen & Unwin.

Chicago Style (17th ed.) Citation

Close, R. A. English as a Foreign Language: Its Constant Grammatical Problems. 3rd ed. London ; Boston: Allen & Unwin, 1981.

MLA (9th ed.) Citation

Close, R. A. English as a Foreign Language: Its Constant Grammatical Problems. 3rd ed. Allen & Unwin, 1981.