De Castro, E. (2017). Powerful Knight at d6. IN Let's Play Chess [column]. Philippine Star.
Cita Chicago (17th ed.)De Castro, Edgar. "Powerful Knight at D6. IN Let's Play Chess [column]." Philippine Star 2017.
Cita MLA (9th ed.)De Castro, Edgar. "Powerful Knight at D6. IN Let's Play Chess [column]." Philippine Star, 2017.
Atenció: Aquestes cites poden no estar 100% correctes.