Gaya APA
Williams, C, H. (1970).
Guide to European source of technical information .Edisi 3 (1970).
:
Guernsey : Francis Hodgson,.
Gaya MLA
Williams, Colin, H.
"Guide to European source of technical information .Edisi 3".
1970
:
Guernsey : Francis Hodgson,,
1970.
Text.