ÜNAL, H. 2010. Proof Without Words: Double Sum for Sine and Cosine. The College Mathematics Journal , vol.41, no.5 .

ÜNAL, H., (2010). Proof Without Words: Double Sum for Sine and Cosine. The College Mathematics Journal , vol.41, no.5.

ÜNAL, Hasan. "Proof Without Words: Double Sum for Sine and Cosine," The College Mathematics Journal , vol.41, no.5, 2010

ÜNAL, Hasan. "Proof Without Words: Double Sum for Sine and Cosine." The College Mathematics Journal , vol.41, no.5, 2010

ÜNAL, H. (2010) . "Proof Without Words: Double Sum for Sine and Cosine." The College Mathematics Journal , vol.41, no.5.

@article{article, author={Hasan ÜNAL}, title={Proof Without Words: Double Sum for Sine and Cosine}, journal={The College Mathematics Journal}, year=2010}