APA-viite (7. p.)

PETTOFREZZO, A. J. (1969). Number systems ; structure and: Properties. Scott, Foresman.

Chicago-viite (17. p.)

PETTOFREZZO, Anthony J. Number Systems ; Structure and: Properties. Glenview, Ill: Scott, Foresman, 1969.

MLA-viite (9. p.)

PETTOFREZZO, Anthony J. Number Systems ; Structure and: Properties. Scott, Foresman, 1969.