APA (7th ed.) Citation

Sierra Leone. Survey Department, Great Britain. Ordnance Survey, Great Britain. Directorate of Overseas Surveys, Great Britain. Directorate of Military Survey, & Great Britain. Army. Royal Engineers. (1968). Sierra Leone (Ed. 7 GSGS.). D. Survey, Ministry of Defence.

Chicago Style (17th ed.) Citation

Sierra Leone. Survey Department, Great Britain. Ordnance Survey, Great Britain. Directorate of Overseas Surveys, Great Britain. Directorate of Military Survey, and Great Britain. Army. Royal Engineers. Sierra Leone. Ed. 7 GSGS. [London]: D. Survey, Ministry of Defence, 1968.

MLA (9th ed.) Citation

Sierra Leone. Survey Department, et al. Sierra Leone. Ed. 7 GSGS. D. Survey, Ministry of Defence, 1968.