"Naval Ranks NMRN Portsmouth". www.nmrn-portsmouth.org.uk. The National Museum Royal Navy, Portsmouth. 2019. Archived from the original on 26 September 2019. Retrieved 8 February 2019.
"Naval Ranks NMRN Portsmouth". www.nmrn-portsmouth.org.uk. The National Museum Royal Navy, Portsmouth. 2019. Archived from the original on 26 September 2019. Retrieved 8 February 2019.