Williams, A., & Sylvester, A. (1929). Public works, past, present and future in the Philippine Islands. s.n.
Lua i Stíl Chicago (17ú heag.)Williams, A.D, agus A.T Sylvester. Public Works, Past, Present and Future in the Philippine Islands. [Tokyo: s.n, 1929.
Lua MLA (9ú heag.)Williams, A.D, agus A.T Sylvester. Public Works, Past, Present and Future in the Philippine Islands. s.n, 1929.
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