Gaya APA

Sihombing, Y, L, V., Pakpahan, H, T. (2001). Elementary & Intermediate Algebra (3). : expert.

Gaya MLA

Sihombing, Yonge, Liston, Verwin., Pakpahan, Helena, Tatcher. "Elementary & Intermediate Algebra". 3 : expert, 2001. Text.