Spyri, Johanna, 1827-1901. Heidi / [electronic resource] / by Johanna Spyri ; with an introd. by Adeline B. Zachert.. — New York : : Holt, Rinehart and Winston,, c1961.. — x, 278 p., [4] leaves of plates : : ill. (some col.) ; 22 cm. — (Great books for children).