APA

Packard A. S., . (1898). A textbook of entomology including the anatomy, physiology, embryology and metamorphoses of insects. New York: the Macmillan company.

Chicago

Packard A S, . 1898. A textbook of entomology including the anatomy, physiology, embryology and metamorphoses of insects. New York: the Macmillan company.

Harvard

Packard A. S., . (1898). A textbook of entomology including the anatomy, physiology, embryology and metamorphoses of insects. New York: the Macmillan company.

MLA

Packard A S, . A textbook of entomology including the anatomy, physiology, embryology and metamorphoses of insects. New York: the Macmillan company. 1898.