APA

frank m. s., jones r. m., Korckover H., Lang P., Mcleod C., Valenta J. & Van Deman A. (2002). Harcourt Science. orlando: harcourt school publishers.

Chicago

frank marjorie slavick, jones robert m, Korckover H,Gerald, Lang P.Mozell, Mcleod C,Joyce, Valenta J,Carol and Van Deman A,Barry. 2002. Harcourt Science. orlando: harcourt school publishers.

Harvard

frank m. s., jones r. m., Korckover H., Lang P., Mcleod C., Valenta J. and Van Deman A. (2002). Harcourt Science. orlando: harcourt school publishers.

MLA

frank marjorie slavick, jones robert m, Korckover H,Gerald, Lang P.Mozell, Mcleod C,Joyce, Valenta J,Carol and Van Deman A,Barry. Harcourt Science. orlando: harcourt school publishers. 2002.