APA (7 वां संस्करण) प्रशस्ति पत्र

(2011). Per Steen Habsgaard's Retrospective at Glasmuseet Ebeltoft: "Everything is possible - until proven otherwise". Neues Glas.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

"Per Steen Habsgaard's Retrospective at Glasmuseet Ebeltoft: "Everything Is Possible - Until Proven Otherwise"." Neues Glas 2011.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

"Per Steen Habsgaard's Retrospective at Glasmuseet Ebeltoft: "Everything Is Possible - Until Proven Otherwise"." Neues Glas, 2011.