APA
Trident Press International, . (1999). The 21st Webster's Family Encyclopedia (Volume 2). Colombia: Trident Press International.
Chicago
Trident Press International, . 1999. The 21st Webster's Family Encyclopedia (Volume 2). Colombia: Trident Press International.
Harvard
Trident Press International, . (1999). The 21st Webster's Family Encyclopedia (Volume 2). Colombia: Trident Press International.
MLA
Trident Press International, . The 21st Webster's Family Encyclopedia (Volume 2). Colombia: Trident Press International. 1999.
