APA

American Petroleum Institute A., . (1980). Relationship between air quality and human perception of scenic areas. Washington: American Petroleum Institute, API.

Chicago

American Petroleum Institute API, . 1980. Relationship between air quality and human perception of scenic areas. Washington: American Petroleum Institute, API.

Harvard

American Petroleum Institute A., . (1980). Relationship between air quality and human perception of scenic areas. Washington: American Petroleum Institute, API.

MLA

American Petroleum Institute API, . Relationship between air quality and human perception of scenic areas. Washington: American Petroleum Institute, API. 1980.