एपीए उद्धरण

Kehl, G. L. (1949). The principles of metallographic laboratory practice (3d ed.). McGraw-Hill.

शिकागो स्टाइल उद्धरण

Kehl, George Louis. The Principles of Metallographic Laboratory Practice. 3d ed. New York: McGraw-Hill, 1949.

एमएलए उद्धरण

Kehl, George Louis. The Principles of Metallographic Laboratory Practice. 3d ed. McGraw-Hill, 1949.