Pennell, M. E., & Cusack, A. M. (1932). The teacher's manual for the Pennell and Cusack pre-primers (A reprint from "The Teachers' manual for the first grade," revised edition.). Ginn and Company.

Pennell, Mary E., and Alice M. Cusack. The Teacher's Manual for the Pennell and Cusack Pre-primers. A reprint from "The Teachers' manual for the first grade," revised edition. Boston: Ginn and Company, 1932.

Pennell, Mary E., and Alice M. Cusack. The Teacher's Manual for the Pennell and Cusack Pre-primers. A reprint from "The Teachers' manual for the first grade," revised edition. Ginn and Company, 1932.