Gaya APA

Holyoake, K., Seal, K, E. (1974). The Ijen Crater Lake Project Feasibility Study . New Zealand: Enex.

Gaya MLA

Holyoake, K.M.., Seal, K., E.. "The Ijen Crater Lake Project Feasibility Study". New Zealand: Enex, 1974. Panas Bumi.