Gaya APA
Sigma, . (2011).
145 questions and answers: start your own business pasti bisa buka usaha (Edisi 1).
Yogyakarta:
ANDI.
Gaya MLA
Sigma, .
"145 questions and answers: start your own business pasti bisa buka usaha".
Edisi 1
Yogyakarta:
ANDI,
2011.
Text.