R. Harper
发表
N. Maier,
R. Harper,
1953
.
Norman R. F. Maier,
N. Maier,
Richard Powers,
1953
.
R. Harper,
1950,
Isis.
R. Schalock,
R. Harper,
T. Genung,
1981,
American journal of mental deficiency.
R. Schalock,
G. Carver,
R. Harper,
1981,
American journal of mental deficiency.
R. Schalock,
R. Harper,
1978,
American journal of mental deficiency.
R. Harper,
1982
.
R. Harper,
1952
.
R L Schalock,
R S Harper,
R. Schalock,
1982,
Evaluation and program planning.
R. Harper,
1962,
Teachers College Record: The Voice of Scholarship in Education.
Robert S. Harper,
J. Young,
J. Z. Young,
1981
.
R. Harper,
W. Ashley,
D. Runyon,
1951,
The American journal of psychology.
R. Harper,
1953,
The American journal of psychology.
R. Harper,
C. McCray,
1962
.
F. T. McAndrew,
R. Harper,
Bernard J. O'Connell,
1985,
Perceptual and motor skills.