APA

Comely R., Elliott G. & Wilkinson S. (1991). Questions Kids Ask About Earth and Sky. Toronto: Grolier Books.

Chicago

Comely Richard, Elliott Greg and Wilkinson Sue. 1991. Questions Kids Ask About Earth and Sky. Toronto: Grolier Books.

Harvard

Comely R., Elliott G. and Wilkinson S. (1991). Questions Kids Ask About Earth and Sky. Toronto: Grolier Books.

MLA

Comely Richard, Elliott Greg and Wilkinson Sue. Questions Kids Ask About Earth and Sky. Toronto: Grolier Books. 1991.