Gaya APA
Leavell, Ullin, Friebele, Mary Louise. (1956).
Widening Horizons .
Chicago:
American Book Company.
Gaya Chicago
Leavell, Ullin, Friebele, Mary Louise.
Widening Horizons.
Chicago:
American Book Company,
1956.
.
Gaya MLA
Leavell, Ullin, Friebele, Mary Louise.
Widening Horizons.
Chicago:
American Book Company,
1956.
.
Gaya Turabian
Leavell, Ullin, Friebele, Mary Louise.
Widening Horizons.
Chicago:
American Book Company,
1956.
.