BrookoverW. B.ThomasS.PetersonA.Self-concept of ability and school achievement. Sociology of Education, 1964, 37, 271–279.
2.
CritesJ. O.Measurement of vocational maturity in adolescence: Attitude test of the Vocational Development Inventory. Psychological Monographs, 1965, 79, No. 2 (Whole No. 595).