Wright, Judith, 1915-2000
The generations of men
Oxford University Press, 1964
 Buku Teks
Wright, Judith, 1915-2000
The Generations of men
Oxford University Press, 1967
 Buku Teks
Nugroho Notosusanto
Generations in Indonesian
Departemen of Defences and Security Centre for Armed Forces History, 1974
 Buku Teks
Haneberg, Lisa
Coaching up and down the generations
American Society for Training & Development, 2010
 eBooks
Rowe, Kim A.
Managing across generations
American Society for Training & Development, 2010
 eBooks