Is the below article a primary or secondary source. what are the key concepts, historical and contemporary relevance. is this source valid and reliable and what is the cultural relevance.

Rotter, J. B., & Mulry, R. C. (1965). Internal versus external control of reinforcement and decision time. Journal of Personality and Social Psychology, 2(4), 598-604. https://doi.org/10.1037/h0022473