Webb, W. L. Railroad Construction: Theory and Practice. a Textbook for the Use of Students in Colleges and Technical Schools. Nabu Press.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিWebb, Walter Loring. Railroad Construction: Theory and Practice. a Textbook for the Use of Students in Colleges and Technical Schools. Nabu Press.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিWebb, Walter Loring. Railroad Construction: Theory and Practice. a Textbook for the Use of Students in Colleges and Technical Schools. Nabu Press.
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