Readings learning and human abilities: educational psychology
edited Richard E. Ripple
Harper & Row , 1971
 Buku Teks
Klausmeier, Herbert J.
Learning and human abilities: educational psychology
Harper and Row, 1975
 Buku Teks
Technology and learning: a look at attitudes and abilities
 Artikel Jurnal
Chruden, Herbert J.
Readings in managing human resources
South-Western, 1984
 Buku Referensi
Readings in human relations
edited by Keith Davis and William G. Scott
McGraw-Hill, 1959
 Buku Teks