Ibarra, C. G. (1982). An investigation of children's ability to solve simple addition and subtraction story problems prior to formal arithmetic instruction. University Microfilms International.
Chicago Style (17th ed.) CitationIbarra, Cheryl Gibbons. An Investigation of Children's Ability to Solve Simple Addition and Subtraction Story Problems Prior to Formal Arithmetic Instruction. Ann Arbor, Mich.: University Microfilms International, 1982.
MLA (8th ed.) CitationIbarra, Cheryl Gibbons. An Investigation of Children's Ability to Solve Simple Addition and Subtraction Story Problems Prior to Formal Arithmetic Instruction. University Microfilms International, 1982.
Warning: These citations may not always be 100% accurate.