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. Габрово: 55-59.
Horka H. Environmental education in undergraduate teacher training as an instrument of civic and professional competencies' development. Габрово: 2012. p. 55-59.
