isbn= value (pemberian). Diakses tanggal 27 Agustus2012.
Fakultas Ilmu Pendidikan Dan Pengetahuansosial
The London review of politics, society, literature, art, & science 11. J.K. Sharpe (1865). p. 121.
Wood, John George (1870). Uncivilized races of men in all countries of the world: being a comprehensive account of their manners and customs, and of their physical, social, mental, budbahasa and religious characteristics