APA (7th ed.) Citation

KEMPF & Richards. (1973). The metric system made simple. Doubleday & Co.

Chicago Style (17th ed.) Citation

KEMPF and Richards. The Metric System Made Simple. New York: Doubleday & Co, 1973.

MLA (8th ed.) Citation

KEMPF and Richards. The Metric System Made Simple. Doubleday & Co, 1973.

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