TAYLOR , B. (1999). YOUNG DISCOVERERS MOUNTAINS AND YOUNG DISCOVERERS VOLCANOES GEOGRAPHY FACTS AND EXPERIMENTS.
Chicago-referens (17:e uppl.)TAYLOR , BARBARA. YOUNG DISCOVERERS MOUNTAINS AND YOUNG DISCOVERERS VOLCANOES GEOGRAPHY FACTS AND EXPERIMENTS. 1999.
MLA-referens (9:e uppl.)TAYLOR , BARBARA. YOUNG DISCOVERERS MOUNTAINS AND YOUNG DISCOVERERS VOLCANOES GEOGRAPHY FACTS AND EXPERIMENTS. 1999.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.