Veselinovska, S. S., and S. Kirova. “Application of Innovative Models in Teaching Methods for Introduction to Nature and Society and Students”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 16, no. 1, May 2014, pp. 58-80, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/1933.