Cambridge University Press, 1991
Buku Teks
Vaillant, George E., author
Little, Brown, 1977
Buku Teks
Ablex Publishing Corporation, 1994
Buku Teks
Rabe-Hesketh, Sophia, author
A Stata Press, 2005
Buku Teks
editor, Garrett Fitzmaurice, Marie Davidian, Geert Verbeke, Geert Molenberghs
CRC Press , 2009
Buku Referensi