APA (7th ed.) Citation

Foster, P. W. (1972). Programmed learning aid for introduction to environmental science. Learning Systems Company.

Chicago Style (17th ed.) Citation

Foster, Phillips W. Programmed Learning Aid for Introduction to Environmental Science. Homewood, Illinois: Learning Systems Company, 1972.

MLA (9th ed.) Citation

Foster, Phillips W. Programmed Learning Aid for Introduction to Environmental Science. Learning Systems Company, 1972.