Gaya APA
Sigijono, C, A.
(2009).
Math for Junior High School 2nd Semester Grade IX
.
Jakarta:
Penerbit Erlangga.
Gaya MLA
Sigijono, Cholik, Adinawan.
"Math for Junior High School 2nd Semester Grade IX".
Jakarta:
Penerbit Erlangga,
2009.
.