Gleitzman, M. (2013). Then (First Square Fish edition.). Square Fish.
Cita Chicago Style (17a ed.)Gleitzman, Morris. Then. First Square Fish edition. New York: Square Fish, 2013.
Cita MLA (8a ed.)Gleitzman, Morris. Then. First Square Fish edition. Square Fish, 2013.
Precaución: Estas citas no son 100% exactas.