National Association of Elementary School Principals (U.S.). (1980). Principal. National Association of Elementary School Principals.
芝加哥风格引文National Association of Elementary School Principals (U.S.). Principal. Arlington, Va.: National Association of Elementary School Principals, 1980.
MLA引文National Association of Elementary School Principals (U.S.). Principal. National Association of Elementary School Principals, 1980.
警告：这些引文格式不一定是100％准确.