Gaya APA
Gultom, S. et al (1985).
Lectures in internal medicine / editors, W. Herdin Sibuea dkk. .
Jakarta:
Rumah Sakit PGI Tjikini.
Gaya MLA
Gultom, S.P. et al.
"Lectures in internal medicine / editors, W. Herdin Sibuea dkk.".
Jakarta:
Rumah Sakit PGI Tjikini,
1985.
Textbook.