Não informado. (1987). International Journal of Surface Mining, Reclamation and Environment. Balkema.
Chicago-referens (17:e uppl.)Não informado. International Journal of Surface Mining, Reclamation and Environment. Rotterdam, Holanda: Balkema, 1987.
MLA-referens (8:e uppl.)Não informado. International Journal of Surface Mining, Reclamation and Environment. Balkema, 1987.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.