Özkan, M. T. 1984. The sunspot observations made in 1979. Istanbul, University, Faculty of Science, Review, Serie C , vol.46 , 179-223.

Özkan, M. T., (1984). The sunspot observations made in 1979. Istanbul, University, Faculty of Science, Review, Serie C , vol.46, 179-223.

Özkan, Mustafa. "The sunspot observations made in 1979," Istanbul, University, Faculty of Science, Review, Serie C , vol.46, 179-223, 1984

Özkan, Mustafa T. . "The sunspot observations made in 1979." Istanbul, University, Faculty of Science, Review, Serie C , vol.46, pp.179-223, 1984

Özkan, M. T. (1984) . "The sunspot observations made in 1979." Istanbul, University, Faculty of Science, Review, Serie C , vol.46, pp.179-223.

@article{article, author={Mustafa Türker ÖZKAN}, title={The sunspot observations made in 1979}, journal={Istanbul, University, Faculty of Science, Review, Serie C}, year=1984, pages={179-223} }