Greenlees, Ian
Norman Douglas / Ian Greenlees
Longman Group, 1971
 Buku Teks
Lindeman, Ralph D
Norman Douglas
Twayne Publishing, 1965
 Buku Teks
Pacific Islands yearbook/edited by Norman and Ngaire Douglas
[Canberra] Angus & Robertson 1989,
 Buku Referensi
Greenlees, Duncan
The gospel of the Guru-Granth Sahib / by Duncan Greenlees
The Theosophical Publishing House, 1952
 Buku Teks
Norman, Donald A, author
Emotional design/ Norman Donald A. Norman
Basic Book, 2004
 Buku Teks
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