Tracy D. Terrell
Terrell, T. D. (1980). A Natural Approach to the Teaching of Verb Forms and Function in Spanish. Foreign Language Annals, 13(2), 129-136.Krashen, S. D., Terrell, T. D., Ehrman, M. E., & Herzog, M. (1984). A Theoretical Basis for Teaching the Receptive Skills. Foreign Language Annals, 17(4), 261-275.