APA Style

Robbins, P, R, &, H, S, K. (1999). Word Problems With Decimals, Proportions, and Percents . : J.Weston Walch.

MLA Style

Robbins, Paul, R, &, Hauge,, Sharon, K. "Word Problems With Decimals, Proportions, and Percents". : J.Weston Walch, 1999. BOOK.