[1] （页面存档备份，存于互联网档案馆） "Balliol was the birthplace of the modern degree of PPE in the 1920s. A.D. Lindsay, who subsequently became the Master of the College, played a key role in the establishment of the degree and Balliol has long remained a major college for the study of PPE, and PPE has long been a major subject within Balliol."
[1] （页面存档备份，存于互联网档案馆） "Balliol was the birthplace of the modern degree of PPE in the 1920s. A.D. Lindsay, who subsequently became the Master of the College, played a key role in the establishment of the degree and Balliol has long remained a major college for the study of PPE, and PPE has long been a major subject within Balliol."
