Mathis, Ayana, author
The twelve tribes of Hattie
Alfred A. Knopf, 2012
 Buku Teks
Hose, Charles, 1863-1929, author
The pagan tribes of Borneo
Oxford University Press, 1993
 Buku Teks
Spencer, Baldwin, 1860-1929, author
The native tribes of central Australia
Macmillan, 1899
 Buku Teks
Hall, John W., author
Twelve doors to Japan
McGraw-Hill, 1965
 Buku Teks
Burnison, Gary, 1961-, author
The twelve absolutes of leadership
McGraw-Hill, 2012
 Buku Teks
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