Carlos, C. B. A study of some basic guiding principles in teaching selected aspects of elementary arithmetic with implications for educational practice and teacher education in the Philippines. University Microfilms.

Carlos, Carmen Balderrama. A Study of Some Basic Guiding Principles in Teaching Selected Aspects of Elementary Arithmetic with Implications for Educational Practice and Teacher Education in the Philippines. Ann Arbor, Mich: University Microfilms.

Carlos, Carmen Balderrama. A Study of Some Basic Guiding Principles in Teaching Selected Aspects of Elementary Arithmetic with Implications for Educational Practice and Teacher Education in the Philippines. University Microfilms.