00669cam a2200205 a 4500001001300000008004100013020001800054020002100072035002000093035002100113041000800134044000700142082001700149100004600166245005200212260012100264300002000385500003000405504002800435ocn122281145901202s1990    sa @@@@  @@@@ 000 0 afr d  a9780620153096  z0620153091 (pbk)  aSANB00000018146  a2000-0000333393807bafr  asa04a378.17220th1 aDu Plooy, W. J.q(Willem Jacobus),d1929-14aDie Didaktiese kontinuum /cdeur W.J. du Plooy.  aPretoria :bW.J. du Plooy,gp/a Unisa, Posbus 392, Pretoria 0001,cc1990e(Pretoria :fUniversiteit van Suid-Afrika)  a25 p. ;c21 cm.  aIntreerede - Unisa, 1990.  aBibliografie: p. 23-25.