Sargent, B. (2005). How heavy is it? Children's Press.
Cita Chicago Style (17a ed.)Sargent, Brian. How Heavy Is It? New York: Children's Press, 2005.
Cita MLA (8a ed.)Sargent, Brian. How Heavy Is It? Children's Press, 2005.
Precaución: Estas citas no son 100% exactas.