Hughes, J. L. (1897). Froebel's educational laws for all teachers. D. Appleton and company.
芝加哥风格引文Hughes, James Laughlin. Froebel's Educational Laws for All Teachers. New York: D. Appleton and company, 1897.
MLA引文Hughes, James Laughlin. Froebel's Educational Laws for All Teachers. D. Appleton and company, 1897.
警告：这些引文格式不一定是100％准确.