Cita APA (7a ed.)

Gurley, W. &. L. E. A manual of the principal instruments used in american engineering and surveying (Thirty first edition.).

Cita Chicago Style (17a ed.)

Gurley, W. & L. E. A Manual of the Principal Instruments Used in American Engineering and Surveying. Thirty first edition. Troy, N. published by W. & L. E. Gurley.

Cita MLA (8a ed.)

Gurley, W. & L. E. A Manual of the Principal Instruments Used in American Engineering and Surveying. Thirty first edition.