Haan, D. B. d. (1958). Guiding principles of activity, based on the application of scientific method: What sociologists should know for the radical improvement of the life of man. Leiden ; Boston: Brill.
استشهاد بنمط شيكاغوHaan, D. Bierens de. Guiding Principles of Activity, Based On the Application of Scientific Method: What Sociologists Should Know for the Radical Improvement of the Life of Man. Leiden ; Boston: Brill, 1958.
MLA استشهادHaan, D. Bierens de. Guiding Principles of Activity, Based On the Application of Scientific Method: What Sociologists Should Know for the Radical Improvement of the Life of Man. Leiden ; Boston: Brill, 1958.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.