Howe, D. P. (1870). Howe's science of language, or, Seven-hour system of grammar. C.F. Livingston's Printing House.
Chicago-referens (17:e uppl.)Howe, D. P. Howe's Science of Language, or, Seven-hour System of Grammar. Manchester: C.F. Livingston's Printing House, 1870.
MLA-referens (8:e uppl.)Howe, D. P. Howe's Science of Language, or, Seven-hour System of Grammar. C.F. Livingston's Printing House, 1870.
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