Pickering, F. P. Archivmaterialien zu Frederick P. Pickering, 1909-1981.
芝加哥风格引文Pickering, Frederick P. Archivmaterialien Zu Frederick P. Pickering, 1909-1981.
MLA引文Pickering, Frederick P. Archivmaterialien Zu Frederick P. Pickering, 1909-1981.
警告：这些引文格式不一定是100％准确.
