Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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