Cita APA (7a ed.)

SPENCER, H. C. c. (1980). Technical Drawing Problems. McMillan Publishing Co. Inc.

Cita Chicago Style (17a ed.)

SPENCER, Henry Cecil cs. Technical Drawing Problems. McMillan Publishing Co. Inc, 1980.

Cita MLA (8a ed.)

SPENCER, Henry Cecil cs. Technical Drawing Problems. McMillan Publishing Co. Inc, 1980.