APA

Röttger E., . (1967). Creative clay design. New York: Reinhold Pub. Corp.

Chicago

Röttger Ernst, . 1967. Creative clay design. New York: Reinhold Pub. Corp.

Harvard

Röttger E., . (1967). Creative clay design. New York: Reinhold Pub. Corp.

MLA

Röttger Ernst, . Creative clay design. New York: Reinhold Pub. Corp. 1967.