Gaya APA
DIRR, M, A.
(1983).
MANUAL of woody landscape plants :
(
3rd. ed.)
.
Champaign, Illinois:
Stipes.
Gaya MLA
DIRR, Michael, A..
"MANUAL of woody landscape plants :".
3rd. ed.
Champaign, Illinois:
Stipes,
1983.
Buku.