APA (7th ed.) Citation

Eckersley, C., & Kaufmann, W. (1970). English and american business letters. Longman.

Chicago Style (17th ed.) Citation

Eckersley, C.E, and W. Kaufmann. English and American Business Letters. London: Longman, 1970.

MLA (9th ed.) Citation

Eckersley, C.E, and W. Kaufmann. English and American Business Letters. Longman, 1970.