APA

Harrar E., Harrar J., . (1946). Guide to Southern Trees. New York: Mcgraw-Hill.

Chicago

Harrar E.s, Harrar J.g, . 1946. Guide to Southern Trees. New York: Mcgraw-Hill.

Harvard

Harrar E., Harrar J., . (1946). Guide to Southern Trees. New York: Mcgraw-Hill.

MLA

Harrar E.s, Harrar J.g, . Guide to Southern Trees. New York: Mcgraw-Hill. 1946.