APA (7th ed.) Citation

Helms, R. N. (1980). Illumination engineering for energy efficient luminous environments. Prentice-Hall.

Chicago Style (17th ed.) Citation

Helms, Ronald N. Illumination Engineering for Energy Efficient Luminous Environments. Englewood Cliffs, N.J.: Prentice-Hall, 1980.

MLA (9th ed.) Citation

Helms, Ronald N. Illumination Engineering for Energy Efficient Luminous Environments. Prentice-Hall, 1980.

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