APA Style

Calkins, L, A, H, A. (2015). Learning About The World Reading Nonfiction Grade 1 Unit 2 . : Firsthand An Imprint of Heinemann.

MLA Style

Calkins, Lucy, And, Hartman,, Amanda. "Learning About The World Reading Nonfiction Grade 1 Unit 2". : Firsthand An Imprint of Heinemann, 2015. BOOK.