SOYKAN, A. Et Al. 2012. Historical development of environmental education in Bulgaria. JOURNAL OF ENVIRONMENTAL BIOLOGY , vol.33, no.2 , 499-508.

SOYKAN, A., ATASOY, E., & Kostova, Z., (2012). Historical development of environmental education in Bulgaria. JOURNAL OF ENVIRONMENTAL BIOLOGY , vol.33, no.2, 499-508.

SOYKAN, ABDULLAH, EMİN ATASOY, And Zdravka Kostova. "Historical development of environmental education in Bulgaria," JOURNAL OF ENVIRONMENTAL BIOLOGY , vol.33, no.2, 499-508, 2012

SOYKAN, ABDULLAH Et Al. "Historical development of environmental education in Bulgaria." JOURNAL OF ENVIRONMENTAL BIOLOGY , vol.33, no.2, pp.499-508, 2012

SOYKAN, A. ATASOY, E. And Kostova, Z. (2012) . "Historical development of environmental education in Bulgaria." JOURNAL OF ENVIRONMENTAL BIOLOGY , vol.33, no.2, pp.499-508.

@article{article, author={ABDULLAH SOYKAN Et Al. }, title={Historical development of environmental education in Bulgaria}, journal={JOURNAL OF ENVIRONMENTAL BIOLOGY}, year=2012, pages={499-508} }