APA

Williamson H., Hudson W. & Zinn C. (1976). Relationships between various classes of road surface roughness and ratings of riding quality. ( Abridgement). : Transportation Research Record.

Chicago

Williamson HJ, Hudson WR and Zinn CD. 1976. Relationships between various classes of road surface roughness and ratings of riding quality. ( Abridgement). : Transportation Research Record.

Harvard

Williamson H., Hudson W. and Zinn C. (1976). Relationships between various classes of road surface roughness and ratings of riding quality. ( Abridgement). : Transportation Research Record.

MLA

Williamson HJ, Hudson WR and Zinn CD. Relationships between various classes of road surface roughness and ratings of riding quality. ( Abridgement). : Transportation Research Record. 1976.