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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)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.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)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.