Cita APA (7a ed.)

Harford, A. (2000). GIMP. Prentice-Hall.

Cita Chicago Style (17a ed.)

Harford, Alex. GIMP. Madrid [etc.]: Prentice-Hall, 2000.

Cita MLA (9a ed.)

Harford, Alex. GIMP. Prentice-Hall, 2000.