WILLIAMS, E., & SHUARD, H. (1970). Elementary mathematics today: A resource for teachersgrades 1-8. Addison-Wesley Pub. Co.
芝加哥风格引文WILLIAMS, Elizabeth, 与 Hilary SHUARD. Elementary Mathematics Today: A Resource for Teachersgrades 1-8. Menlo Park: Addison-Wesley Pub. Co, 1970.
MLA引文WILLIAMS, Elizabeth, 与 Hilary SHUARD. Elementary Mathematics Today: A Resource for Teachersgrades 1-8. Addison-Wesley Pub. Co, 1970.
警告：这些引文格式不一定是100％准确.