Factors affecting teachers' gain in understanding the nature of scienceVictor Y. Billeh; Omar E. Hasan · 1975

The development and application of a scale for measuring scientific attitudesVictor Y. Billeh; George A. Zakhariades · 1975

Comparative investigation of the psychometric properties of three tests of logical thinkingKapur S. Ahlawat; Victor Y. Billeh · 1987

Relationship between teachers' change in attitudes toward science and some professional variablesOmar E. Hasan; Victor Y. Billeh · 1975

The factor structure of the longeot test: A measure of logical thinkingKapur S. Ahlawat; Victor Y. Billeh · 1982

Development and application of a test on understanding the nature of scienceFletcher G. Watson; Victor Y. Billeh; Muhammad H. Malik · 1977

Cultural bias in the attainment of concepts of the biological cell by elementary school childrenVictor Y. Billeh; Milton O. Pella · 1970

Relationship between mental maturity, ability level, and level of understanding of three categories of science conceptsVictor Y. Billeh; Milton O. Pella · 1972