APA Style

Office, U, H. (2021). Admiralty List of Radio Signals Volume 5 Second Edition 2021: Global Maritime Distress and Safety System (GMDSS) NP285 (2nd edition). United Kingdom: United Kingdom Hydrographic Office.

MLA Style

Office, UK, Hydrographic. "Admiralty List of Radio Signals Volume 5 Second Edition 2021: Global Maritime Distress and Safety System (GMDSS) NP285". 2nd edition United Kingdom: United Kingdom Hydrographic Office, 2021. Text.