APA (7th ed.) Citation

Ryan, B. C. (1977). Computation of times of sunrise, sunset, and twilight in or near mountainous terrain. Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station.

Chicago Style (17th ed.) Citation

Ryan, Bill C. Computation of Times of Sunrise, Sunset, and Twilight in or Near Mountainous Terrain. Berkeley, Calif.: Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station, 1977.

MLA (9th ed.) Citation

Ryan, Bill C. Computation of Times of Sunrise, Sunset, and Twilight in or Near Mountainous Terrain. Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station, 1977.