Helvacı, M. Et Al. 2005. Amateur and Professional Researches at the Ankara University Observatory. The Journal of the American Association of Variable Star Observers , vol.33, no.2 , 212-217.

Helvacı, M., Elmaslı Akçar, A., Tanrıverdi, T., Özavcı, İ., Törün, E., Albayrak, B., ... Selam, S. O.(2005). Amateur and Professional Researches at the Ankara University Observatory. The Journal of the American Association of Variable Star Observers , vol.33, no.2, 212-217.

Helvacı, Mustafa Et Al. "Amateur and Professional Researches at the Ankara University Observatory," The Journal of the American Association of Variable Star Observers , vol.33, no.2, 212-217, 2005

Helvacı, Mustafa Et Al. "Amateur and Professional Researches at the Ankara University Observatory." The Journal of the American Association of Variable Star Observers , vol.33, no.2, pp.212-217, 2005

Helvacı, M. Et Al. (2005) . "Amateur and Professional Researches at the Ankara University Observatory." The Journal of the American Association of Variable Star Observers , vol.33, no.2, pp.212-217.

@article{article, author={Mustafa Helvacı Et Al. }, title={Amateur and Professional Researches at the Ankara University Observatory}, journal={The Journal of the American Association of Variable Star Observers}, year=2005, pages={212-217} }