Eichler, G. A., Parks, C. G., & Lehman, J. (1973). Continental practice exercises in English. Continental Press.

Eichler, G. A., Carroll G. Parks, and John Lehman. Continental Practice Exercises in English. Elizabethtown, Pa. : Atlanta [etc.]: Continental Press, 1973.

Eichler, G. A., et al. Continental Practice Exercises in English. Continental Press, 1973.