Petersen, S. R. (1991). ZIP - the Zip-Code Insulation Program, version 2.0: Economic insulation levels for new and existing houses by three-digit zip code : users guide and reference manual (revised edition). U.S. Dept. of Commerce, National Institute of Standards and Technology.
Chicago Style (17th ed.) CitationPetersen, Stephen R. ZIP - the Zip-Code Insulation Program, Version 2.0: Economic Insulation Levels for New and Existing Houses by Three-digit Zip Code : Users Guide and Reference Manual (revised Edition). Gaithersburg, MD: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1991.
MLA (9th ed.) CitationPetersen, Stephen R. ZIP - the Zip-Code Insulation Program, Version 2.0: Economic Insulation Levels for New and Existing Houses by Three-digit Zip Code : Users Guide and Reference Manual (revised Edition). U.S. Dept. of Commerce, National Institute of Standards and Technology, 1991.