Gruen, J. J., & Spring, J. (1999). Facing the Artist: John Jonas Gruen. With a foreword by Justin Spring. Prestel.
Lua i Stíl Chicago (17ú heag.)Gruen, John Jonas, agus Justin Spring. Facing the Artist: John Jonas Gruen. With a Foreword by Justin Spring. München [u.a.]: Prestel, 1999.
Lua MLA (8ú heag.)Gruen, John Jonas, agus Justin Spring. Facing the Artist: John Jonas Gruen. With a Foreword by Justin Spring. Prestel, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.