1. LambPose Guiding Children's Language Learning. Dubuque: Wm. C. Brown, 1971. p. 208.
2. The Attainment of Objectives in Handwriting
3. BurnsPaul C., BromanBetty L., and LoweAlberta L. The Language Arts in Childhood Education, Second Edition. Chicago: Rand McNally, 1971. p. 335.
4. LambPoseop. cit., p. 210.