Hallas, C. H. (1970). The care and training of the mentally subnormal (4th ed.). Williams and Wilkins.
芝加哥风格引文Hallas, Charles H. The Care and Training of the Mentally Subnormal. 4th ed. Baltimore: Williams and Wilkins, 1970.
MLA引文Hallas, Charles H. The Care and Training of the Mentally Subnormal. 4th ed. Williams and Wilkins, 1970.
警告：这些引文格式不一定是100％准确.