Steel, Duncan, author
Marking time : the epic quest to invent the perfect calendar
John Wiley & Sons, 2000
 Buku Referensi
Larsen, Jen, author
Future perfect
HarperTeen, an imprint of HarperCollinsPublishers, 2015
 Buku Teks
Chase's calendar of events 2012
McGaw-Hill, 2012
 Multimedia
Millett, John, 1921-
Calendar Adam / John Millet
South Head Press, 1971
 Buku Teks
Calendar for the sixtieth session 1975-1976
Austin and Sons, 1976
 Buku Teks
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