APA (7th ed.) Citation

Washington Gas Light Company. (1977). Consumer guide to insulation. [Washington Gas].

Chicago Style (17th ed.) Citation

Washington Gas Light Company. Consumer Guide to Insulation. [Washington, D.C.]: [Washington Gas], 1977.

MLA (9th ed.) Citation

Washington Gas Light Company. Consumer Guide to Insulation. [Washington Gas], 1977.

Warning: These citations may not always be 100% accurate.