APA (7th ed.) Citation

Gurley, firm, math. instr. makers, Troy. (1921. W. & L.E. Gurley). (1921). A manual of the principal instruments used in American engineering and surveying (48th ed.). W. & L. E. Gurley.

Chicago Style (17th ed.) Citation

Gurley, firm, math. instr. makers, Troy. (1921. W. & L.E. Gurley). A Manual of the Principal Instruments Used in American Engineering and Surveying. 48th ed. Troy, N.Y.: W. & L. E. Gurley, 1921.

MLA (9th ed.) Citation

Gurley, firm, math. instr. makers, Troy. (1921. W. & L.E. Gurley). A Manual of the Principal Instruments Used in American Engineering and Surveying. 48th ed. W. & L. E. Gurley, 1921.