Friend, S. (1999). Earth's hidden treasures. Twenty-First Century Books.
Chicago Style (17th ed.) CitationFriend, Sandra. Earth's Hidden Treasures. Brookfield, Conn.: Twenty-First Century Books, 1999.
MLA (8th ed.) CitationFriend, Sandra. Earth's Hidden Treasures. Twenty-First Century Books, 1999.
Warning: These citations may not always be 100% accurate.
