APA (7th ed.) Citation

Portsmouth Polytechnic. Cartographic Unit. (1987). World mapping today. Butterworths.

Chicago Style (17th ed.) Citation

Portsmouth Polytechnic. Cartographic Unit. World Mapping Today. London: Butterworths, 1987.

MLA (9th ed.) Citation

Portsmouth Polytechnic. Cartographic Unit. World Mapping Today. Butterworths, 1987.

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