H Johnson. (1966). The Oxford companion to American history. Oxford, New York: Oxford Univ. Press.
Dyfyniad Arddull ChicagoH Johnson. The Oxford Companion to American History. Oxford, New York: Oxford Univ. Press, 1966.
Dyfyniad MLAH Johnson. The Oxford Companion to American History. Oxford, New York: Oxford Univ. Press, 1966.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.