Cita APA (7th ed.)

Earle, J. H. (1971). Descriptive geometry. Addison-Wesley.

Cita Chicago (17th ed.)

Earle, J. H. Descriptive Geometry. Readings: Addison-Wesley, 1971.

Cita MLA (9th ed.)

Earle, J. H. Descriptive Geometry. Addison-Wesley, 1971.