Παραπομπή σε μορφή APA (7η εκδ.)

Tower, D. B., & Tweed, B. F. (1855). Gradual lessons in grammar, or, Guide to the construction of the English language by the analysis and composition of sentences. Daniel Burgess & Co..

Παραπομπή σε μορφή Chicago (17η εκδ.)

Tower, David B., και Benjamin F. Tweed. Gradual Lessons in Grammar, or, Guide to the Construction of the English Language by the Analysis and Composition of Sentences. New York: Daniel Burgess & Co., 1855.

Παραπομπή σε μορφή MLA (8th εκδ.)

Tower, David B., και Benjamin F. Tweed. Gradual Lessons in Grammar, or, Guide to the Construction of the English Language by the Analysis and Composition of Sentences. Daniel Burgess & Co., 1855.