APA (7th ed.) Citation

Ousterhout, J. (1999). Extensibility in Tcl. Dr. Dobb's Journal: The World of Software Development, 24(6), 64.

Chicago Style (17th ed.) Citation

Ousterhout, John. "Extensibility in Tcl." Dr. Dobb's Journal: The World of Software Development 24, no. 6 (1999): 64.

MLA (9th ed.) Citation

Ousterhout, John. "Extensibility in Tcl." Dr. Dobb's Journal: The World of Software Development, vol. 24, no. 6, 1999, p. 64.