Professional Book Publishers. (2019). The Post Office Act, 1898 (06 of 1898). Professional Book Publishers.
芝加哥风格引文Professional Book Publishers. The Post Office Act, 1898 (06 of 1898). New Delhi: Professional Book Publishers, 2019.
MLA引文Professional Book Publishers. The Post Office Act, 1898 (06 of 1898). Professional Book Publishers, 2019.
警告：这些引文格式不一定是100％准确.