Kaplony-Heckel, U. Archivmaterialien zu Ursula Kaplony-Heckel, 1924-2021.
芝加哥风格引文Kaplony-Heckel, Ursula. Archivmaterialien Zu Ursula Kaplony-Heckel, 1924-2021.
MLA引文Kaplony-Heckel, Ursula. Archivmaterialien Zu Ursula Kaplony-Heckel, 1924-2021.
警告：这些引文格式不一定是100％准确.