Gomperz, Theodor, author
John Murray, 1949
Buku Teks
Windelband, Wilhelm, author
Happer & Brothers, 1901
Buku Teks
edited by Sir Lawrence Gowing
Grange Book, 1995
Buku Referensi
Hall, Jonathan M., auhtor
Wiley-Blackwell, 2014
Buku Teks
edited by Deborah Cherry
Blackwell, 2005
Buku Teks