APA (7th ed.) Citation

Willis, R. Letter: International Brigade members held prisoner in French concentration camps.

Chicago Style (17th ed.) Citation

Willis, Robert. Letter: International Brigade Members Held Prisoner in French Concentration Camps.

MLA (8th ed.) Citation

Willis, Robert. Letter: International Brigade Members Held Prisoner in French Concentration Camps.

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