Gaya APA
Spinoza, Benedict De. (1949).
Ethics (Cofyright).
New York:
Hafner Publishing Company.
Gaya Chicago
Spinoza, Benedict De.
Ethics.
Cofyright
New York:
Hafner Publishing Company,
1949.
Text.
Gaya MLA
Spinoza, Benedict De.
Ethics.
Cofyright
New York:
Hafner Publishing Company,
1949.
Text.
Gaya Turabian
Spinoza, Benedict De.
Ethics.
Cofyright
New York:
Hafner Publishing Company,
1949.
Print.