APA Edition Citation

Clarke, I. C. (1913). The secret citadel / by I.C. Clarke. Hutchinson.

Chicago Edition Citation

Clarke, I. C. The Secret Citadel / by I.C. Clarke. Hutchinson, 1913.

MLA Edition Citation

Clarke, I. C. The Secret Citadel / by I.C. Clarke. Hutchinson, 1913.

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