A national index for energy productivity : a study

MLA

Penz, Alton J, and Dennis Bakke. A National Index for Energy Productivity : a Study. Washington: U.S. Government Printing Office, 1981.

APA

Penz, A. J, & Bakke, D. (1981). A national index for energy productivity : a study. Washington: U.S. Government Printing Office.

Chicago

Penz, Alton J., and Dennis Bakke. A National Index for Energy Productivity: A Study. Washington: U.S. Government Printing Office, 1981.