Williams, A., & Sylvester, A. (1929). Public works, past, present and future in the Philippine Islands. s.n.
芝加哥风格引文Williams, A.D, 与 A.T Sylvester. Public Works, Past, Present and Future in the Philippine Islands. [Tokyo: s.n, 1929.
MLA引文Williams, A.D, 与 A.T Sylvester. Public Works, Past, Present and Future in the Philippine Islands. s.n, 1929.
警告：这些引文格式不一定是100％准确.