Cita APA (7th ed.)

MORRIS LANGDON. (2006). PERMANENT INNOVATION. INNOVATION ACA.

Cita Chicago (17th ed.)

MORRIS LANGDON. PERMANENT INNOVATION. WALNUT CREEK; USA: INNOVATION ACA, 2006.

Cita MLA (9th ed.)

MORRIS LANGDON. PERMANENT INNOVATION. INNOVATION ACA, 2006.

Atenció: Aquestes cites poden no estar 100% correctes.