Spengler, Oswald, author
Alfred A. Knopp, 1947
Buku Teks
edited by Joachim Herrmann, Joachim Herrmann and Erik Zurcher
Routledge, 1996
Buku Referensi
edited by S.J. De Leat, A.H. Dani, J.L. Lorenzo and R.B. Nunoo
Routledge , 1994
Buku Referensi
edited by A.H. Dani and J.P. Mohen
Routledge , 1996
Buku Referensi
edited by John Henry Raleigh
Holt, Rinehart and Winston, 1962
Buku Teks