APA

Essex Institute, American Society of Naturalists, . (1868). The american naturalist. Salem, (Mass., EE UU.): The American Society of Naturalists.

Chicago

Essex Institute, American Society of Naturalists, . 1868. The american naturalist. Salem, (Mass., EE UU.): The American Society of Naturalists.

Harvard

Essex Institute, American Society of Naturalists, . (1868). The american naturalist. Salem, (Mass., EE UU.): The American Society of Naturalists.

MLA

Essex Institute, American Society of Naturalists, . The american naturalist. Salem, (Mass., EE UU.): The American Society of Naturalists. 1868.