WILLIAMS, K. W. (1970). Arithmetic: A semiprogrammed text. Prentice-Hall.
Chicagoスタイル(17版)引用形式WILLIAMS, Keith W. Arithmetic: A Semiprogrammed Text. Englewood Cliffs, N.J: Prentice-Hall, 1970.
MLA(9版)引用形式WILLIAMS, Keith W. Arithmetic: A Semiprogrammed Text. Prentice-Hall, 1970.
警告: この引用は必ずしも正確ではありません.