APA
Willett J. D., . (1991). Gas chromatography. John Wiley & Sons: Singapore.
Chicago
Willett John;Kealey David(ed), . 1991. Gas chromatography. John Wiley & Sons: Singapore.
Harvard
Willett J. D., . (1991). Gas chromatography. John Wiley & Sons: Singapore.
MLA
Willett John;Kealey David(ed), . Gas chromatography. John Wiley & Sons: Singapore. 1991.