Guillaume, Xavier. author
Routledge, 2011
Buku Teks
Dibben, Pauline, author
Chartered Institute of Personnel and Development, 2011
Buku Teks
Kydd, Andrew H., 1963-, author
Cambridge University Press, 2015
Buku Teks
Kawira, Jack David, author
Sekolah Tinggi Teologi Reformed Injili Internasional (STTRII), 2018
Artikel Jurnal
Griffith, Martin, author
Routledge, 2002
Buku Teks