APA (7th ed.) Citation

Marten, M. (1977). Worlds within worlds: A journey into the unknown. Secker and Warburg.

Chicago Style (17th ed.) Citation

Marten, Michael. Worlds Within Worlds: A Journey into the Unknown. London: Secker and Warburg, 1977.

MLA (8th ed.) Citation

Marten, Michael. Worlds Within Worlds: A Journey into the Unknown. Secker and Warburg, 1977.

Warning: These citations may not always be 100% accurate.