APA

Williamson R., . (1975). State of the art of emulsion pavements in region 6 of the U.S. forest service. : Transportation Research Board. Special report nr 160.

Chicago

Williamson R, . 1975. State of the art of emulsion pavements in region 6 of the U.S. forest service. : Transportation Research Board. Special report nr 160.

Harvard

Williamson R., . (1975). State of the art of emulsion pavements in region 6 of the U.S. forest service. : Transportation Research Board. Special report nr 160.

MLA

Williamson R, . State of the art of emulsion pavements in region 6 of the U.S. forest service. : Transportation Research Board. Special report nr 160. 1975.