Searles, W. H. (1902). Field engineering: A hand-book of the theory and practice of railway surveying, location, and construction, designed for the class-room, field, and office, and containing a large number of useful tables, original and selected (16th ed.). J. Wiley & Sons; [etc.].
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিSearles, William H. Field Engineering: A Hand-book of the Theory and Practice of Railway Surveying, Location, and Construction, Designed for the Class-room, Field, and Office, and Containing a Large Number of Useful Tables, Original and Selected. 16th ed. New York: J. Wiley & Sons; [etc.], 1902.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিSearles, William H. Field Engineering: A Hand-book of the Theory and Practice of Railway Surveying, Location, and Construction, Designed for the Class-room, Field, and Office, and Containing a Large Number of Useful Tables, Original and Selected. 16th ed. J. Wiley & Sons; [etc.], 1902.