Dyfyniad APA

Hemstock, H. F., & Costelloe, P. (1969). Modern business arithmetic (3rd ed.). Nelson.

Dyfyniad Arddull Chicago

Hemstock, H. F., and P.J Costelloe. Modern Business Arithmetic. 3rd ed. [S.l.]: Nelson, 1969.

Dyfyniad MLA

Hemstock, H. F., and P.J Costelloe. Modern Business Arithmetic. 3rd ed. Nelson, 1969.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.