Não informado. (1960). Technical communication. Department of Agriculture and Water Supply.
Chicago-Zitierstil (17. Ausg.)Não informado. Technical Communication. Pretoria, Africa do Sul: Department of Agriculture and Water Supply, 1960.
MLA-Zitierstil (8. Ausg.)Não informado. Technical Communication. Department of Agriculture and Water Supply, 1960.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.