Aaron, I. E. 1., Artley, A. S. 1., Goodman, K. S., Jenkins, W. A. 1., & Manning, J. C. (1976). Endeavors and studybook: Teacher's edition : level 20. Glenview, Illinois: Scott, Foresman.

Aaron, Ira Edward 1919-, A. Sterl 1907-1998 Artley, Kenneth S. Goodman, William Atwell 1922-1998 Jenkins, and John C. Manning. Endeavors and Studybook: Teacher's Edition : Level 20. Glenview, Illinois: Scott, Foresman, 1976.

Aaron, Ira Edward 1919-, et al. Endeavors and Studybook: Teacher's Edition : Level 20. Glenview, Illinois: Scott, Foresman, 1976.