Schaeffer, C. C. (1890). Self-help by self-work: The automatic teacher of English reading (writing) and spelling, by thought and sight : spelling redeemed, or the child made its own teacher ... issued in parts : first part, complete in itself, first one thousand words, with suggestions introduced from a second part, the child seen at work, in mending and extending its lines. Philadelphia: Charles, Brother & Co..

Schaeffer, C. C. Self-help By Self-work: The Automatic Teacher of English Reading (writing) and Spelling, By Thought and Sight : Spelling Redeemed, or the Child Made Its Own Teacher ... Issued in Parts : First Part, Complete in Itself, First One Thousand Words, With Suggestions Introduced From a Second Part, the Child Seen At Work, in Mending and Extending Its Lines. Philadelphia: Charles, Brother & Co., 1890.

Schaeffer, C. C. Self-help By Self-work: The Automatic Teacher of English Reading (writing) and Spelling, By Thought and Sight : Spelling Redeemed, or the Child Made Its Own Teacher ... Issued in Parts : First Part, Complete in Itself, First One Thousand Words, With Suggestions Introduced From a Second Part, the Child Seen At Work, in Mending and Extending Its Lines. Philadelphia: Charles, Brother & Co., 1890.