Gaya APA
Constable, .
(1961).
Vacuum Producing Equipment E.E.U.A Handbook No. 11
.
London:
Cox & Wyman Ltd.
Gaya MLA
Constable, .
"Vacuum Producing Equipment E.E.U.A Handbook No. 11".
London:
Cox & Wyman Ltd,
1961.
Text.