O`Dell, Andrew C.
Railways and geography
Hutchinson University Library, 1971
 Buku Teks SO
Rao, B.V.
World history / B.V. Rao
terling Publishers Private, 1984
 Buku Teks SO
Harahap, Basyral Hamidy, 1940-
Greget Tuanku Rao
Komunitas Bambu, 2007
 Buku Teks SO
Rao, Sunil S.
Switchgear and protection / Sunil S. Rao
Khanna, 1978
 Buku Teks SO
Duffy, Michael C.
Electric railways 1880-1990
Institution of Engineering and Technology, 2008
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