Ong, E. G. (1991). Winning in real estate, Philippine style. Worldlink Realty & Management Corporation.
Lua i Stíl Chicago (17ú heag.)Ong, Eduardo Gutierrez. Winning in Real Estate, Philippine Style. [S.l.]: Worldlink Realty & Management Corporation, 1991.
Lua MLA (9ú heag.)Ong, Eduardo Gutierrez. Winning in Real Estate, Philippine Style. Worldlink Realty & Management Corporation, 1991.
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