Cita APA (7th ed.)
Wright, F. L., & Pfeiffer, B. B. Letters to Apprentices. California State University.
Cita Chicago (17th ed.)
Wright, Frank Lloyd, i Bruce Brooks Pfeiffer. Letters to Apprentices. Fresno, EUA: California State University.
Cita MLA (9th ed.)
Wright, Frank Lloyd, i Bruce Brooks Pfeiffer. Letters to Apprentices. California State University.
Atenció: Aquestes cites poden no estar 100% correctes.