Citazione Stile APA (7a Edizione)

Gruen, J. J., & Spring, J. (1999). Facing the Artist: John Jonas Gruen. With a foreword by Justin Spring. Prestel.

Citazione stile Chigago Style (17a edizione)

Gruen, John Jonas, e Justin Spring. Facing the Artist: John Jonas Gruen. With a Foreword by Justin Spring. München [u.a.]: Prestel, 1999.

Citatione MLA (8a ed.)

Gruen, John Jonas, e Justin Spring. Facing the Artist: John Jonas Gruen. With a Foreword by Justin Spring. Prestel, 1999.