Lua APA (7ú heag.)

Estupigan, R. (1999). The compatibility factor. Manila Bulletin.

Lua i Stíl Chicago (17ú heag.)

Estupigan, Ruth. "The Compatibility Factor." Manila Bulletin 1999.

Lua MLA (9ú heag.)

Estupigan, Ruth. "The Compatibility Factor." Manila Bulletin, 1999.

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