Cita APA (7a ed.)

Walraet, B. (1989). Programming, the impossible challenge. North-Holland.

Cita Chicago Style (17a ed.)

Walraet, Bob. Programming, the Impossible Challenge. Amsterdam [etc.]: North-Holland, 1989.

Cita MLA (9a ed.)

Walraet, Bob. Programming, the Impossible Challenge. North-Holland, 1989.