Gaya APA

, ., E., I, S, N, L, I, L, D, V, I, L, M, M, I, R, R. (2004). Teaching elementary mathemetics: a resource for fiel experience . America: .

Gaya MLA

, ., E., I., Smith,, Nancy, L., II., Lambdin,, Diana, V., III., Lindquist,, Mary, M., IV., Reys,, Robert. "Teaching elementary mathemetics: a resource for fiel experience". America: , 2004. Text.