Bettencourt, W. L. (1953). A source book of materials relating to the teaching of mechanical drawing as a graphic language. [publisher not identified].
Chicago Style (17th ed.) CitationBettencourt, William Leal. A Source Book of Materials Relating to the Teaching of Mechanical Drawing as a Graphic Language. [Place of publication not identified]: [publisher not identified], 1953.
MLA (9th ed.) CitationBettencourt, William Leal. A Source Book of Materials Relating to the Teaching of Mechanical Drawing as a Graphic Language. [publisher not identified], 1953.
Warning: These citations may not always be 100% accurate.