Çelik, S. (2014). The effects of learning journals on reflective ability and metacognitive learning: The effects of learning journals on reflective ability and metacognitive learning : the attitudes of graduate students in an English language teaching methodology course = Učinci portfolija na sposobnost refleksije i metakognitivno učenje : stavovi studenata diplomskog studija u sklopu kolegija Metodika nastave engleskog jezika. Hrvatski časopis za odgoj i obrazovanje (Tisak), p. 6.

Çelik, Servet. "The effects of learning journals on reflective ability and metacognitive learning: The effects of learning journals on reflective ability and metacognitive learning : the attitudes of graduate students in an English language teaching methodology course = Učinci portfolija na sposobnost refleksije i metakognitivno učenje : stavovi studenata diplomskog studija u sklopu kolegija Metodika nastave engleskog jezika." 2014: 6.

Çelik, Servet. "The effects of learning journals on reflective ability and metacognitive learning: The effects of learning journals on reflective ability and metacognitive learning : the attitudes of graduate students in an English language teaching methodology course = Učinci portfolija na sposobnost refleksije i metakognitivno učenje : stavovi studenata diplomskog studija u sklopu kolegija Metodika nastave engleskog jezika." 2014: 6.