Spiller, G. (1909). Report on moral instruction: General & denominational) and on moral training in the schools of Austria, Belgium, the British Empire, China, Denmark, France, Germany, Holland, Hungary, Italy, Japan, Norway, Portugal, Spain, Sweden, Switzerland, Turkey, & the United States. Watts.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Spiller, Gustav. Report on Moral Instruction: General & Denominational) and on Moral Training in the Schools of Austria, Belgium, the British Empire, China, Denmark, France, Germany, Holland, Hungary, Italy, Japan, Norway, Portugal, Spain, Sweden, Switzerland, Turkey, & the United States. London: Watts, 1909.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Spiller, Gustav. Report on Moral Instruction: General & Denominational) and on Moral Training in the Schools of Austria, Belgium, the British Empire, China, Denmark, France, Germany, Holland, Hungary, Italy, Japan, Norway, Portugal, Spain, Sweden, Switzerland, Turkey, & the United States. Watts, 1909.