Gaya APA
Harefa, A. (2002).
Mutiara Pembelajar : Andrias Harefa's Values On Becoming A Learning (cet.3).
YOGYAKARTA:
Gloria Cyber Ministries.
Gaya MLA
Harefa, Andrias.
"Mutiara Pembelajar : Andrias Harefa's Values On Becoming A Learning".
cet.3
YOGYAKARTA:
Gloria Cyber Ministries,
2002.
Text.