Pengaruh persepsi kedekatan dengan korban dan pelaku terhadap intensi menolong para pedagang kaki lima sebagai bystander non siswa pada kejadian bullying di sekolah = The influence of perceived closeness to the victims and the bullies upon intention to help among street vendors as non student bystanders in bullying cases occurring in schools / Diva Marini Octavia - Diva Marini Octavia, author (Fakultas Psikologi Universitas Indonesia, 2014)