Hubungan antara komunikasi interpersonal dan kompetensi berbahasa Inggris terhadap kinerja siswa kelas internasional : survei pada siswa SMA Negeri eks-RSBI Provinsi DKI Jakarta = The relation between interpersonal communication and English language proficiency toward the student's performance in international program : a survey on the student of ex-RSBI Senior High School in Jakarta Province / Gunawan Wiradharma - Gunawan Wiradharma, author (2013)