Hasskarl, G. C. H. (1914). Modern problems of the home, school, and church: Solved by Christian pedagogy and sociology (2d ed. enl.). On sale at General Council Pub. House.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Hasskarl, Gottlieb Christopher Henry. Modern Problems of the Home, School, and Church: Solved by Christian Pedagogy and Sociology. 2d ed. enl. Philadelphia, Pa.: On sale at General Council Pub. House, 1914.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Hasskarl, Gottlieb Christopher Henry. Modern Problems of the Home, School, and Church: Solved by Christian Pedagogy and Sociology. 2d ed. enl. On sale at General Council Pub. House, 1914.
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