ÜNAL, H. 2009. Proof without words:An Arctangent Identity. Mathematics Magazine , vol.82, no.1 .

ÜNAL, H., (2009). Proof without words:An Arctangent Identity. Mathematics Magazine , vol.82, no.1.

ÜNAL, Hasan. "Proof without words:An Arctangent Identity," Mathematics Magazine , vol.82, no.1, 2009

ÜNAL, Hasan. "Proof without words:An Arctangent Identity." Mathematics Magazine , vol.82, no.1, 2009

ÜNAL, H. (2009) . "Proof without words:An Arctangent Identity." Mathematics Magazine , vol.82, no.1.

@article{article, author={Hasan ÜNAL}, title={Proof without words:An Arctangent Identity}, journal={Mathematics Magazine}, year=2009}