Horka, H. Environmental education in undergraduate teacher training as an instrument of civic and professional competencies' development. Габрово: 2012 55-59,.
Horka, H. Environmental education in undergraduate teacher training as an instrument of civic and professional competencies' development. Габрово: 2012 55-59,.
Horka, H. (2012) Environmental education in undergraduate teacher training as an instrument of civic and professional competencies' development, Габрово: 55-59,.
Horka, H. (2012). Environmental education in undergraduate teacher training as an instrument of civic and professional competencies' development. Формиране на гражданина и професионалиста в условията на университетското образование (с. 55-59). Габрово: Кн. 1 Т. 2 (1).
Horka H. Environmental education in undergraduate teacher training as an instrument of civic and professional competencies' development. Габрово: 2012. p. 55-59.
