APA

American Association of State Highway Officials, . (1949). Manual of highway construction practices and methods. Washington DC: American Association of State Highway Officials.

Chicago

American Association of State Highway Officials, . 1949. Manual of highway construction practices and methods. Washington DC: American Association of State Highway Officials.

Harvard

American Association of State Highway Officials, . (1949). Manual of highway construction practices and methods. Washington DC: American Association of State Highway Officials.

MLA

American Association of State Highway Officials, . Manual of highway construction practices and methods. Washington DC: American Association of State Highway Officials. 1949.