APA (7th ed.) Citation

Great Britain. Directorate of Overseas Surveys. (1970). Christmas Island, Gilbert and Ellice Islands Colony (Ed. 4-D.O.S.). Directorate of Overseas Surveys.

Chicago Style (17th ed.) Citation

Great Britain. Directorate of Overseas Surveys. Christmas Island, Gilbert and Ellice Islands Colony. Ed. 4-D.O.S. [Tolworth]: Directorate of Overseas Surveys, 1970.

MLA (9th ed.) Citation

Great Britain. Directorate of Overseas Surveys. Christmas Island, Gilbert and Ellice Islands Colony. Ed. 4-D.O.S. Directorate of Overseas Surveys, 1970.