Godwin, H. C. (1894). Railroad engineers' field-book and explorers' guide: Especially adapted to the use of railroad engineers on location and construction and to the needs of the explorer in making exploratory surveys (2nd, rev. ed.). Wiley.
Παραπομπή σε μορφή Chicago (17η εκδ.)Godwin, H. C. Railroad Engineers' Field-book and Explorers' Guide: Especially Adapted to the Use of Railroad Engineers on Location and Construction and to the Needs of the Explorer in Making Exploratory Surveys. 2nd, rev. ed. New York: Wiley, 1894.
Παραπομπή σε μορφή MLA (8th εκδ.)Godwin, H. C. Railroad Engineers' Field-book and Explorers' Guide: Especially Adapted to the Use of Railroad Engineers on Location and Construction and to the Needs of the Explorer in Making Exploratory Surveys. 2nd, rev. ed. Wiley, 1894.