APA (7th ed.) Citation

North Central Forest Experiment Station (Saint Paul, Minn.). (1977). How to measure tree crown widths. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station.

Chicago Style (17th ed.) Citation

North Central Forest Experiment Station (Saint Paul, Minn.). How to Measure Tree Crown Widths. [St. Paul]: Dept. of Agriculture, Forest Service, North Central Forest Experiment Station, 1977.

MLA (9th ed.) Citation

North Central Forest Experiment Station (Saint Paul, Minn.). How to Measure Tree Crown Widths. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station, 1977.