Purković, D., & Jelaska, I. (2014). The impact of selected contextual factors on the teachers' perception of the achievement of goals and objectives in teaching technical culture: The impact of selected contextual factors on the teachers' perception of the achievement of goals and objectives in teaching technical culture = Utjecaj odabranih kontekstualnih čimbenika na nastavnikovu percepciju ostvarenosti ciljeva i zadaća nastave tehničke kulture. Hrvatski časopis za odgoj i obrazovanje (Tisak), p. 6.

Purković, Damir, and Igor Jelaska. "The impact of selected contextual factors on the teachers' perception of the achievement of goals and objectives in teaching technical culture: The impact of selected contextual factors on the teachers' perception of the achievement of goals and objectives in teaching technical culture = Utjecaj odabranih kontekstualnih čimbenika na nastavnikovu percepciju ostvarenosti ciljeva i zadaća nastave tehničke kulture." 2014: 6.

Purković, Damir, and Igor Jelaska. "The impact of selected contextual factors on the teachers' perception of the achievement of goals and objectives in teaching technical culture: The impact of selected contextual factors on the teachers' perception of the achievement of goals and objectives in teaching technical culture = Utjecaj odabranih kontekstualnih čimbenika na nastavnikovu percepciju ostvarenosti ciljeva i zadaća nastave tehničke kulture." 2014: 6.