Cita APA (7th ed.)

Fehr, H. F., & Phillips, J. M. (1972). Teaching modern mathematics in the elementary school (2d ed.). Addison-Wesley Pub. Co.

Cita Chicago (17th ed.)

Fehr, Howard F., i Jo McKeeby Phillips. Teaching Modern Mathematics in the Elementary School. 2d ed. Reading, Mass: Addison-Wesley Pub. Co, 1972.

Cita MLA (9th ed.)

Fehr, Howard F., i Jo McKeeby Phillips. Teaching Modern Mathematics in the Elementary School. 2d ed. Addison-Wesley Pub. Co, 1972.