Gauld, Alan, author
Cambridge University Press, 1992
Buku Referensi
Meeus, Adrien de, author
Frederick A. Praeger, 1962
Buku Referensi
edited by Sir Lawrence Gowing
Grange Book, 1995
Buku Referensi
Sastri, K.A. Nilakanta, author
S. Viswanathan, 1950
Buku Teks
Syamananda, Rong, author
Thai Watana Panich, 1973
Buku Teks