Chen, Ruo Ling
Nu xing gongzuo sheng ya / Chen Ruo Ling
Tian xia wen hua chu ban gu fen you xian gong si,, [date of publication not identified]
 Buku Teks
Kompetensi profesional guru SMK bidang keahlian teknik bangunan di Medan
 Artikel Jurnal
Heap D.A., Brian
Vocational degree course offers 1987: students guide to careers and courses /by Brian Heap D.A.
Careers Consultants, 1986
 Buku Teks
Suparno, author
Marketing profesional : straategi dan trik dalam menjual produk
Restu Agung, 2004
 Buku Teks
Sinaga, Martha, author
Habit Profesional
Gramedia, 2006
 Buku Teks
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