Citazione Stile APA (7a Edizione)

Crowley, W. R. (1997). Chemicals on the Internet: A directory of industry sites. Gulf Pub. Co.

Citazione stile Chigago Style (17a edizione)

Crowley, William R. Chemicals on the Internet: A Directory of Industry Sites. Houston, Tex: Gulf Pub. Co, 1997.

Citatione MLA (9a ed.)

Crowley, William R. Chemicals on the Internet: A Directory of Industry Sites. Gulf Pub. Co, 1997.