Johnson, E. R. (1909). Elements of transportation: A discussion of steam railroad, electric railway, and ocean and inland water transportation. D. Appleton and Company.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Johnson, Emory R. Elements of Transportation: A Discussion of Steam Railroad, Electric Railway, and Ocean and Inland Water Transportation. New York, ; London,: D. Appleton and Company, 1909.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Johnson, Emory R. Elements of Transportation: A Discussion of Steam Railroad, Electric Railway, and Ocean and Inland Water Transportation. D. Appleton and Company, 1909.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.