APA (7th ed.) Citation

Allred, J. W., Barringer, S. R., Kirby, C. E., & Shinn, J. M. (1977). An inexpensive economical solar heating system for homes. Solar Energy Information Services.

Chicago Style (17th ed.) Citation

Allred, Johnny W., Sheridan R. Barringer, Cecil E. Kirby, and Joseph M. Shinn. An Inexpensive Economical Solar Heating System for Homes. New York, NY: Solar Energy Information Services, 1977.

MLA (8th ed.) Citation

Allred, Johnny W., et al. An Inexpensive Economical Solar Heating System for Homes. Solar Energy Information Services, 1977.