Slappey, S. G. (1973). Pioneers of American business: Comp. by Sterling G. Slappey (2. print.). Grosset & Dunlap.
Chicago-Zitierstil (17. Ausg.)Slappey, Sterling G. Pioneers of American Business: Comp. by Sterling G. Slappey. 2. print. New York [u.a.]: Grosset & Dunlap, 1973.
MLA-Zitierstil (8. Ausg.)Slappey, Sterling G. Pioneers of American Business: Comp. by Sterling G. Slappey. 2. print. Grosset & Dunlap, 1973.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.