Gaya APA
Harefa, A. (2001).
Mutiara pembelajar (= Andrias Harefa's values on becoming a learner) .
Yogyakarta:
Gloria Cyber Ministries (GCM).
Gaya MLA
Harefa, Andrias.
"Mutiara pembelajar (= Andrias Harefa's values on becoming a learner)".
Yogyakarta:
Gloria Cyber Ministries (GCM),
2001.
Text.