APA (7th ed.) Citation

Lucas, J. R. (1989). Harper test: User's manual IBM version. Economics Research, Harper & Row Software.

Chicago Style (17th ed.) Citation

Lucas, John R. Harper Test: User's Manual IBM Version. Calif: Economics Research, Harper & Row Software, 1989.

MLA (9th ed.) Citation

Lucas, John R. Harper Test: User's Manual IBM Version. Economics Research, Harper & Row Software, 1989.