Gaya APA
Dirgeyasa, I, W., Hartoyo, I. (1990).
The Art Of Scientific Writing: A Comprehensive and Practical Guide .
Medan:
FBS Unimed Press.
Gaya MLA
Dirgeyasa, I, Wy.., Hartoyo, Indra.
"The Art Of Scientific Writing: A Comprehensive and Practical Guide".
Medan:
FBS Unimed Press,
1990.
Text.