Dobson, Rosemary
Over the frontier
Angus & Robertson, 1978
Buku Teks SO
Frontier Society
Martinus Njhoff, 1971
Buku Teks SO
Frontier Society
Martinus Njhoff, 1971
Buku Teks
Roy, Gabrielle
Hidden mountain
McClelland and Steward, 1975
Koleksi Publik
Capra, Fritjof
The hidden connections
Harper Collins, 2002
Buku Teks