William Soltau Davidson, 1846-1924 : a sketch of his life, [by himself], covering a period of fifty-two years, 1864-1916, in the employment of the New Zealand and Australian Land Company Limited.
Davidson, William Soltau,1846-1924.
Edinburgh :  for private circulation, by Oliver & Boyd,
1930.
Davidson, William Soltau, 1846-1924.
New Zealand and Australian Land Company Ltd.