Gaya APA
Ritchie, Donald. (1983).
Biology .
California:
Addison-Wesley.
Gaya Chicago
Ritchie, Donald.
Biology.
California:
Addison-Wesley,
1983.
Tesis.
Gaya MLA
Ritchie, Donald.
Biology.
California:
Addison-Wesley,
1983.
Tesis.
Gaya Turabian
Ritchie, Donald.
Biology.
California:
Addison-Wesley,
1983.
Tesis.