Gaya APA
Introduction to the soil ecosistem. (1974).
New York:
Longman.
Gaya Chicago
Introduction to the soil ecosistem.
.
New York:
Longman,
1974.
Buku.
Gaya MLA
Introduction to the soil ecosistem.
.
New York:
Longman,
1974.
Buku.
Gaya Turabian
Introduction to the soil ecosistem.
New York:
Longman,
1974.
Buku.