APA (7th ed.) Citation

LaChapelle, E. R. (1971). Avalanches on the North Cascades Highway (SR-20). Washington State Highway Dept.].

Chicago Style (17th ed.) Citation

LaChapelle, Edward R. Avalanches on the North Cascades Highway (SR-20). Seattle ; Olympia: Washington State Highway Dept.], 1971.

MLA (9th ed.) Citation

LaChapelle, Edward R. Avalanches on the North Cascades Highway (SR-20). Washington State Highway Dept.], 1971.