Style de citation APA (7e éd.)

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

Style de citation Chicago (17e éd.)

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

Style de citation MLA (8e éd.)

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