Sheppard-Towner Act of 1921. Great Neck Publishing.
芝加哥风格引文Sheppard-Towner Act of 1921. Great Neck Publishing.
MLA引文Sheppard-Towner Act of 1921. Great Neck Publishing.
警告：这些引文格式不一定是100％准确.
APA引文
Sheppard-Towner Act of 1921. Great Neck Publishing.
芝加哥风格引文Sheppard-Towner Act of 1921. Great Neck Publishing.
MLA引文Sheppard-Towner Act of 1921. Great Neck Publishing.