APA (7th ed.) Citation

Lehmann, R. P. M., & Lehmann, W. P. (1975). An introduction to Old Irish. Modern Language Association of America.

Chicago Style (17th ed.) Citation

Lehmann, Ruth P. M., and Winfred P. Lehmann. An Introduction to Old Irish. New York: Modern Language Association of America, 1975.

MLA (8th ed.) Citation

Lehmann, Ruth P. M., and Winfred P. Lehmann. An Introduction to Old Irish. Modern Language Association of America, 1975.