Gaya APA

Stumpf, S, A. (1994). Leaning to use what you already kjnow . San Fransisco: Berrett-Koehler Pub..

Gaya MLA

Stumpf, Stephen, A.. "Leaning to use what you already kjnow". San Fransisco: Berrett-Koehler Pub., 1994. Printed Book.