APA (7th ed.) Citation

Neumayer, E. J., & Rutan, E. J. Harper's workbook in English. Harper & Brothers, [c1948].

Chicago Style (17th ed.) Citation

Neumayer, Engelbert J., and Edward J. Rutan. Harper's Workbook in English. New York ; London: Harper & Brothers, [c1948].

MLA (8th ed.) Citation

Neumayer, Engelbert J., and Edward J. Rutan. Harper's Workbook in English. Harper & Brothers, [c1948].