Morris, P. A. (1945). They hop and crawl. Jacques Cattell Press.
Chicagoスタイル(17版)引用形式Morris, Percy A. They Hop and Crawl. Lancaster, Pennsylvania: Jacques Cattell Press, 1945.
MLA(9版)引用形式Morris, Percy A. They Hop and Crawl. Jacques Cattell Press, 1945.
警告: この引用は必ずしも正確ではありません.