WALLENKAMPF, Arnold Valentin. The Herero rebellion in South West Africa 1904 - 1906. - Ann Arbor : University Microfilms, 1977.
UNITED NATIONS INSTITUTE FOR NAMIBIA (UNIN)
UNITED NATIONS INSTITUTE FOR NAMIBIA (UNIN)
http://192.168.151.11//wallenkampf-arnold-valentin-herero-rebellion-in-south-west-africa-1904-1906-ann-arbor-university-microfilms-1977
PA 4/1/1/655(NAM 968.8 Wal )