UPEJ (Unnes Physics Education Journal) | Universitas Negeri Semarang. Cambridge University Press.
Cita Chicago (17th ed.)UPEJ (Unnes Physics Education Journal) | Universitas Negeri Semarang. Cambridge University Press.
Cita MLA (8th ed.)UPEJ (Unnes Physics Education Journal) | Universitas Negeri Semarang. Cambridge University Press.
Atenció: Aquestes cites poden no estar 100% correctes.