Gaya APA
Crockett, J, U., Sekarningsih, A.
(1972).
Trees
(
Edisi 1)
.
Virginia:
Time Life Book.
Gaya MLA
Crockett, James, Underwood., Sekarningsih, Ani.
"Trees".
Edisi 1
Virginia:
Time Life Book,
1972.
Text.