Gaya APA
First International Tug Conference. (1970).
England:
Thomas Reed Publications.
Gaya Chicago
First International Tug Conference.
.
England:
Thomas Reed Publications,
1970.
Text.
Gaya MLA
First International Tug Conference.
.
England:
Thomas Reed Publications,
1970.
Text.
Gaya Turabian
First International Tug Conference.
England:
Thomas Reed Publications,
1970.
Print.