APA (7th ed.) Citation

Kelland, C. B. Mark Tidd's Citadel.

Chicago Style (17th ed.) Citation

Kelland, Clarence Budington. Mark Tidd's Citadel.

MLA (9th ed.) Citation

Kelland, Clarence Budington. Mark Tidd's Citadel.

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