APA

Stephenson P., Hartwig G., . (1992). SQL: self-teaching guide. New York: Wiley.

Chicago

Stephenson Peter, Hartwig Glenn, . 1992. SQL: self-teaching guide. New York: Wiley.

Harvard

Stephenson P., Hartwig G., . (1992). SQL: self-teaching guide. New York: Wiley.

MLA

Stephenson Peter, Hartwig Glenn, . SQL: self-teaching guide. New York: Wiley. 1992.