Original work

Fries, C.C. (1945) . Teaching and Learning English as a Foreign Language University of Michigan Press, Ann Arbor.

Fries, C.C. (1952). The Structure of English. New York: Harcourt, Brace & Co.

Fries, C. C., & Lado, R. (1957). English Sentence Patterns: Understanding and Producing English Grammatical Structures—An Oral Approach. Ann Arbor: University of Michigan Press.

Fries, C. C., & Lado, R. (1958). English Pattern Practices: Establishing the Patterns as Habits. Ann Arbor: University of Michigan Press.

Secondary sources

Hockett, C. (1987) A Leonard Bloomfield Anthology. University of Chicago Press.

Brown Mitchell, C. B. and Vidal, K. E. (2001), Weighing the Ways of the Flow: Twentieth Century Language Instruction. The Modern Language Journal, 85: 26–38. PDF

Current references by Bley-Vroman (PDF) and Zwicky.