Berfikir Positif dan Komunikasi yang Efektif

Azwar, S. (2012). Penyusunan skala psikologi. Yogyakarta: Pustaka Pelajar.

Azwar, S. (2016). Tes prestasi. Yogyakarta: Pustaka Pelajar.

Bandura, A. (1995). Self-efficacy in changing societies. New York: Cambridge University Press.

Baron, R. A., & Byrne, D. (2003). Psikologi sosial. Jakarta: Erlangga.

Bodie, G. D. (2010). A racing heart , rattling knees , and ruminative thoughts : defining , explaining , and treating public speaking anxiety. Communication Education, 59(1), 70–105.

Chandra, A. (2017). The relationship between emotional maturity and positive thinking on the students of psychology faculty of medan area university ( uma ), medan , indonesia. Journal Of Humanities And Social Science, 22(10), 11–20.