APA (7th ed.) Zitazioa

WILLIAMS, K. W. (1970). Arithmetic: A semiprogrammed text. Prentice-Hall.

Chicago Style (17th ed.) Zitazioa

WILLIAMS, Keith W. Arithmetic: A Semiprogrammed Text. Englewood Cliffs, N.J: Prentice-Hall, 1970.

MLA (9th ed.) Zitazioa

WILLIAMS, Keith W. Arithmetic: A Semiprogrammed Text. Prentice-Hall, 1970.