APA

Lauber P., . (1994). Be a Friend to Trees. New York: Holly Keller.

Chicago

Lauber Patricia, . 1994. Be a Friend to Trees. New York: Holly Keller.

Harvard

Lauber P., . (1994). Be a Friend to Trees. New York: Holly Keller.

MLA

Lauber Patricia, . Be a Friend to Trees. New York: Holly Keller. 1994.