Cita APA (7th ed.)

EARLE, J. H. (1978). Descriptive geometry.-- Ed.2. Addison-Wesley Pub. Co.

Cita Chicago (17th ed.)

EARLE, James H. Descriptive Geometry.-- Ed.2. Massachusetts: Addison-Wesley Pub. Co, 1978.

Cita MLA (9th ed.)

EARLE, James H. Descriptive Geometry.-- Ed.2. Addison-Wesley Pub. Co, 1978.