References
- Anastasi , A. 1967 . “ ‘Mechanical aptitude’ ” . In Psychological Testing , 387 New York : Macmillan .
- Okunrotifa , P. O. 1968 . ‘A comparison of the responses of Nigerian pupils to two sets of programmed instruction materials in Geography’ . Programmed Learning and Educational Technology , Oct. : 283 – 93 .
- Okunrotifa , P. O. Nov. 1973 . “ ‘The establishment of the validities of experimental materials in Geography’ ” . In The Journal of Geography , Nov. , Washington : National Council for Geographic Education .
- Okunrotifa , P. O. 1974 . “ ‘The performance of Nigerian pupils in a programmed unit of Geography’ ” . In Savanna , Zaria, , Nigeria : Ahmadu Bello University .
- Roebuck , M. 1967 . ‘A report on the evaluative use of the program “Bracket” in Form 2 of the International School, Ibadan’ , Institute of Education, University of Ibadan .
- Rosenthal , R. 1964 . ‘The effect of the experimenter on the results of psychological research’ . Progress in Experimental Personality Research , 1 : 79 – 114 .