National Institute of industrial psychology. (1927). Occupational Psychology. National Institute of industrial psychology.
استشهاد بنمط شيكاغوNational Institute of industrial psychology. Occupational Psychology. London: National Institute of industrial psychology, 1927.
MLA استشهادNational Institute of industrial psychology. Occupational Psychology. National Institute of industrial psychology, 1927.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.