APA (7th ed.) Citation

Purnell, H. (1962). Gas, chromatography. John Wiley & Sons.

Chicago Style (17th ed.) Citation

Purnell, Howard. Gas, Chromatography. New York: John Wiley & Sons, 1962.

MLA (9th ed.) Citation

Purnell, Howard. Gas, Chromatography. John Wiley & Sons, 1962.