APA

American Petroleum Institute A., . (1983). Effects of air quality and visibility on human perception of scenic beauty. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 1983. Effects of air quality and visibility on human perception of scenic beauty. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (1983). Effects of air quality and visibility on human perception of scenic beauty. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Effects of air quality and visibility on human perception of scenic beauty. Washington: American Petroleum Institute, API. 1983.