edited by Alexander Sturgis and Hollis Clayson
Watson-Guptill, 2000
Buku Teks SO
Andi Setyo Pambudi
Badan Perencanaan Pembangunan Nasional (BAPPENAS), 2019
Artikel Jurnal
Lamb, Harold
Doubleday, 1955
Buku Teks SO
Fraser, John Munro
London, Sir Issac Pitman
Buku Teks SO
Tarantino, Angelo Marcello
Springer Nature, 2019
eBooks