J. P. Jordaan

n Studie oor die bepaling van teelwaarde vir agronomiese meriete by koring

J. P. Jordaan, 1965 .

Die evaluasie van teelmeriete in koringteelprogramme

J. P. Jordaan, 1968 .

Vocational maturity during the high school years

J. P. Jordaan, D. Super, Martha Bennett Heyde, 1979 .

The Choice of a Vocation

J. P. Jordaan, 1955 .

Career Development: Self-Concept Theory

J. P. Jordaan, Donald E. Super, D. Super, 1963 .

Career development theory

J. P. Jordaan, 1977 .