Tcl and the Tk Toolkit.

MLA

Ousterhout, John K., and Ken Jones. Tcl and the Tk Toolkit. 2nd ed. Upper Saddle River: Addison-Wesley, 2010.

APA

Ousterhout, J. K., & Jones, K. (2010). Tcl and the Tk Toolkit. 2nd ed. Upper Saddle River: Addison-Wesley.

Chicago

Ousterhout, John K., and Ken Jones. Tcl and the Tk Toolkit. 2nd ed. Upper Saddle River: Addison-Wesley, 2010.