Gaya APA
Ferber, Robert. (19).
What is a survey/ Robert Ferber .
Washington:
America Statistical AS.
Gaya Chicago
Ferber, Robert.
What is a survey/ Robert Ferber.
Washington:
America Statistical AS,
19.
.
Gaya MLA
Ferber, Robert.
What is a survey/ Robert Ferber.
Washington:
America Statistical AS,
19.
.
Gaya Turabian
Ferber, Robert.
What is a survey/ Robert Ferber.
Washington:
America Statistical AS,
19.
.