Gaya APA
Firsten, R., Killian, P. (1993).
Troublesome english: a teaching grammar for ESOL instructors .
Englewood:
Prentice Hall.
Gaya MLA
Firsten, Richard., Killian, Patricia.
"Troublesome english: a teaching grammar for ESOL instructors".
Englewood:
Prentice Hall,
1993.
Text.