Erlangga,13 International Maritime Organization,8 Pustaka Beta,4 the nautical institute,4 ITB,3 IMO,3 international chamber of shipping,2 Brown, Son & Ferguson,2 Gramedia Pusaka Utama,2 mandar Maju,2 International Maritime Organization (IMO),2 Admiralty Charts And Publications,2 Butterworth Heinemann,2 Djambatan,2 witherby,2 Imarest,2 Cendikia,1 Gama Media,1 Cornell Maritime Press,1 United Kingdom Hydrographic Official,1