APA (7th ed.) Citation

Davis, R. H. (1973). Learning system design: An approach to the improvement of instruction. The Authors.

Chicago Style (17th ed.) Citation

Davis, Robert Harlan. Learning System Design: An Approach to the Improvement of Instruction. Michigan: The Authors, 1973.

MLA (9th ed.) Citation

Davis, Robert Harlan. Learning System Design: An Approach to the Improvement of Instruction. The Authors, 1973.