APA

Siebel T. M., . (1999). Cyber rules: strategies for excelling at e-business. New York: Currency / Doubleday.

Chicago

Siebel Thomas M, . 1999. Cyber rules: strategies for excelling at e-business. New York: Currency / Doubleday.

Harvard

Siebel T. M., . (1999). Cyber rules: strategies for excelling at e-business. New York: Currency / Doubleday.

MLA

Siebel Thomas M, . Cyber rules: strategies for excelling at e-business. New York: Currency / Doubleday. 1999.