Freeman, H. (1962). Finite differences for acturial students (2nd.). Univ. Press.
Dyfyniad Arddull ChicagoFreeman, Harry. Finite Differences for Acturial Students. 2nd. Cambridge: Univ. Press, 1962.
Dyfyniad MLAFreeman, Harry. Finite Differences for Acturial Students. 2nd. Univ. Press, 1962.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.