APA

Vallier T. L., . (1986). Geology of the Blue Mountains region of Oregon, Idaho, and Washington. Washington, DC: US Gov. Print. Office.

Chicago

Vallier Tracy L, . 1986. Geology of the Blue Mountains region of Oregon, Idaho, and Washington. Washington, DC: US Gov. Print. Office.

Harvard

Vallier T. L., . (1986). Geology of the Blue Mountains region of Oregon, Idaho, and Washington. Washington, DC: US Gov. Print. Office.

MLA

Vallier Tracy L, . Geology of the Blue Mountains region of Oregon, Idaho, and Washington. Washington, DC: US Gov. Print. Office. 1986.