Hotchkiss, W. K. I. (2001). Alumni bat for ROTC / William K. Hotchkiss, III and Panfilo V. Villaruel. Philippine Star.
Tohutoru Kātū Chicago (17th ed.)Hotchkiss, William K. III. "Alumni Bat for ROTC / William K. Hotchkiss, III and Panfilo V. Villaruel." Philippine Star 2001.
Tohutoro MLA (9th ed.)Hotchkiss, William K. III. "Alumni Bat for ROTC / William K. Hotchkiss, III and Panfilo V. Villaruel." Philippine Star, 2001.
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