RICHARDS, R. (1991). An Early Start To Technology From Science Roy Richars. Simon and Schuster.
Chicago-referens (17:e uppl.)RICHARDS, Roy. An Early Start To Technology From Science Roy Richars. Simon and Schuster, 1991.
MLA-referens (8:e uppl.)RICHARDS, Roy. An Early Start To Technology From Science Roy Richars. Simon and Schuster, 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.