H. N.  Ridley, ?New or rare Malayan plants, Series II?, Journal of the Straits Branch of the Royal Asiatic Society, vol. 44, pp. 189 - 211, 1905.

H. N.  Ridley, ?New Malayan plants?, Journal of the Straits Branch of the Royal Asiatic Society, vol. 41, pp. 31 - 51, 1904.

H. N.  Ridley, ?New or rare Malayan plants, Series VII?, Journal of the Straits Branch of the Royal Asiatic Society, vol. 69, pp. 11 - 14, 1915.

H. N.  Ridley, ?The Burmanniaceae of the Malay peninsula?, Journal of the Straits Branch of the Royal Asiatic Society, vol. 22, pp. 331 - 339, 1890.

H. N.  Ridley, ?Petrosavia stellaris?, Journal of the Straits Branch of the Royal Asiatic Society, vol. 1891, p.  - 170, 1891.