APA (7th ed.) Citation

Blake, G. N. (1980). Chisholm's Handbook of commercial geography (20. ed. rev.). Longman.

Chicago Style (17th ed.) Citation

Blake, G. N. Chisholm's Handbook of Commercial Geography. 20. ed. rev. London <<[u.a.]>>: Longman, 1980.

MLA (9th ed.) Citation

Blake, G. N. Chisholm's Handbook of Commercial Geography. 20. ed. rev. Longman, 1980.