APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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

Let op: Deze citaties zijn niet altijd 100% accuraat.