Gaya APA
Bowker, R.
(1977).
Ulrich's International Periodicals Directory
(
1977)
.
:
New York : R R Bowker Co., ,.
Gaya MLA
Bowker, RR.
"Ulrich's International Periodicals Directory".
1977
:
New York : R R Bowker Co., ,,
1977.
Text.