Gaya APA
Purnell, H, (. (1973).
New developments in gas chromatography. Volume 11 (1973).
:
New York : John Wiley & Sons,.
Gaya MLA
Purnell, Howard, (ed).
"New developments in gas chromatography. Volume 11".
1973
:
New York : John Wiley & Sons,,
1973.
Text.