Deterline, W. A. (1962). Variations in programs. In W. A. Deterline, An introduction to programed instruction (pp. 37-49). Englewood Cliffs, NJ, US: Prentice-Hall, Inc.
http://dx.doi.org/10.1037/13118-004
Many proponents of auto-instructional methods agree that a mechanical teaching machine is probably not necessary for the presentation of programed material to the student. Glaser, Homme, and Evans (1959) designed a "programed textbook" which has gained widespread acceptance as a non-mechanical form of presentation of the Skinner-type small frame programs. This chapter discusses variations in programmed instruction. (PsycINFO Database Record (c) 2016 APA, all rights reserved)