Gaya APA

Let's Be Friends Grade 1.2 / Houghton Mifflin. (2008). U.S.A: Houghton Mifflin Harcourt Publishing Company.

Gaya MLA

Let's Be Friends Grade 1.2 / Houghton Mifflin. Cetakan I. U.S.A: Houghton Mifflin Harcourt Publishing Company, 2008. Text.