Spencer, H., Duncan, D., & Tedder, H. R. Descriptive sociology: Or, Groups of Sociological facts (Second edition.).
استشهاد بنمط شيكاغوSpencer, Herbert, David Duncan, و Henry Richard Tedder. Descriptive Sociology: Or, Groups of Sociological Facts. Second edition.
MLA استشهادSpencer, Herbert, David Duncan, و Henry Richard Tedder. Descriptive Sociology: Or, Groups of Sociological Facts. Second edition.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.