APA (7th ed.) Citation

Duggan, R. B., & Shaffer, F. R. (1983). Retrofitting for energy savings with hydronic heating systems. Specifying Engineer, 49, 104.

Chicago Style (17th ed.) Citation

Duggan, R. B., and F. R. Shaffer. "Retrofitting for Energy Savings with Hydronic Heating Systems." Specifying Engineer 49 (1983): 104.

MLA (9th ed.) Citation

Duggan, R. B., and F. R. Shaffer. "Retrofitting for Energy Savings with Hydronic Heating Systems." Specifying Engineer, vol. 49, 1983, p. 104.