Gaya APA
Stepping forward. (1999).
tempaterbit:
penerbit.
Gaya Chicago
Stepping forward.
Edisi.
tempaterbit:
penerbit,
1999.
Text.
Gaya MLA
Stepping forward.
Edisi.
tempaterbit:
penerbit,
1999.
Text.
Gaya Turabian
Stepping forward.
tempaterbit:
penerbit,
1999.
Print.