Franklin, H. B., Strain, J. E., & Meikle, H. G. (1968). Vocabulary in context (6ª ed.). The University of Michigan Press.

Franklin, Harry B., Jeries E. Strain, and Herbert G. Meikle. Vocabulary in Context. 6ª ed. The University of Michigan Press, 1968.

Franklin, Harry B., et al. Vocabulary in Context. 6ª ed. The University of Michigan Press, 1968.