Indon, R. M. (1999). The Informal sector. IN Commentary [column]. Philippine Daily Inquirer.
芝加哥风格引文Indon, Reginald M. "The Informal Sector. IN Commentary [column]." Philippine Daily Inquirer 1999.
MLA引文Indon, Reginald M. "The Informal Sector. IN Commentary [column]." Philippine Daily Inquirer, 1999.
警告：这些引文格式不一定是100％准确.