SELAM, S. O. And Albayrak, B. 2007. Orbital period variation of the eclipsing binary system TT Herculis. ASTRONOMISCHE NACHRICHTEN , vol.328, no.2 , 154-158.

SELAM, S. O., & Albayrak, B., (2007). Orbital period variation of the eclipsing binary system TT Herculis. ASTRONOMISCHE NACHRICHTEN , vol.328, no.2, 154-158.

SELAM, SELİM, And B. Albayrak. "Orbital period variation of the eclipsing binary system TT Herculis," ASTRONOMISCHE NACHRICHTEN , vol.328, no.2, 154-158, 2007

SELAM, SELİM O. And Albayrak, B.. "Orbital period variation of the eclipsing binary system TT Herculis." ASTRONOMISCHE NACHRICHTEN , vol.328, no.2, pp.154-158, 2007

SELAM, S. O. And Albayrak, B. (2007) . "Orbital period variation of the eclipsing binary system TT Herculis." ASTRONOMISCHE NACHRICHTEN , vol.328, no.2, pp.154-158.

@article{article, author={SELİM OSMAN SELAM And author={B. Albayrak}, title={Orbital period variation of the eclipsing binary system TT Herculis}, journal={ASTRONOMISCHE NACHRICHTEN}, year=2007, pages={154-158} }