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.
Lua i Stíl Chicago (17ú heag.)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.
Lua MLA (8ú heag.)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.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.