Брод — разлика између измена

| first = Thomas J.|title = Dutton's Nautical Navigation

| edition = 15th

| location = Annapolis, MD|isbn=978-1-55750-248-3

}}

| title = Chapman Piloting and Seamanship

| edition = 64th

| location = New York|isbn=978-1-58816-089-8}}

* {{cite web|url=http://www.marad.dot.gov/MARAD_statistics/2005%20STATISTICS/World%20Merchant%20Fleet%202005.pdf