Galopin, R., & Henry, N. F. M. (1972). Microscopic study of opaque minerals. W. Heffer and Sons Ltd.
Lua i Stíl Chicago (17ú heag.)Galopin, R., agus N. F. M. Henry. Microscopic Study of Opaque Minerals. Cambridge: W. Heffer and Sons Ltd, 1972.
Lua MLA (9ú heag.)Galopin, R., agus N. F. M. Henry. Microscopic Study of Opaque Minerals. W. Heffer and Sons Ltd, 1972.
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