Kocer, D. 1980. The sunspot observations made in 1975. Istanbul Üniversitesi Fen Fakultesi Mecmuası , no.45 , 187-203.

Kocer, D., (1980). The sunspot observations made in 1975. Istanbul Üniversitesi Fen Fakultesi Mecmuası , no.45, 187-203.

Kocer, DURSUN. "The sunspot observations made in 1975," Istanbul Üniversitesi Fen Fakultesi Mecmuası , no.45, 187-203, 1980

Kocer, DURSUN. "The sunspot observations made in 1975." Istanbul Üniversitesi Fen Fakultesi Mecmuası , no.45, pp.187-203, 1980

Kocer, D. (1980) . "The sunspot observations made in 1975." Istanbul Üniversitesi Fen Fakultesi Mecmuası , no.45, pp.187-203.

@article{article, author={DURSUN KOÇER}, title={The sunspot observations made in 1975}, journal={Istanbul Üniversitesi Fen Fakultesi Mecmuası}, year=1980, pages={187-203} }