APA (7th ed.) Citation

Giesecke, F. E., & Spencer, H. C. Technical drawing (4a. edición revisada.).

Chicago Style (17th ed.) Citation

Giesecke, Frederick Ernest, and Henry Cecil Spencer. Technical Drawing. 4a. edición revisada. New York.

MLA (9th ed.) Citation

Giesecke, Frederick Ernest, and Henry Cecil Spencer. Technical Drawing. 4a. edición revisada.

Warning: These citations may not always be 100% accurate.