Humbert, N., & Penzel, W. (1999). Robert Lax: Why should I buy a bed when all that I want is sleep? ; A Chamber-Film with Robert Lax / by Nicolas Humbert & Werner Penzel. Pociao's Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHumbert, Nicolas, और Werner Penzel. Robert Lax: Why Should I Buy a Bed When All That I Want Is Sleep? ; A Chamber-Film with Robert Lax / by Nicolas Humbert & Werner Penzel. Bonn: Pociao's Books, 1999.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHumbert, Nicolas, और Werner Penzel. Robert Lax: Why Should I Buy a Bed When All That I Want Is Sleep? ; A Chamber-Film with Robert Lax / by Nicolas Humbert & Werner Penzel. Pociao's Books, 1999.
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