APA (7th ed.) Citation

Gentle G. G. (1970). Progressive exercises in english. Methuen educational LTD.

Chicago Style (17th ed.) Citation

Gentle G. G. Progressive Exercises in English. London: Methuen educational LTD, 1970.

MLA (8th ed.) Citation

Gentle G. G. Progressive Exercises in English. Methuen educational LTD, 1970.

Warning: These citations may not always be 100% accurate.