Gaya APA

Swanson, C, P. (NULL). Glolier academic encyclopedia jilid 18 Sne-Sz . USA:: USA: Grolier International; 1991.

Gaya MLA

Swanson, Carl, P.. "Glolier academic encyclopedia jilid 18 Sne-Sz". USA:: USA: Grolier International; 1991, NULL. Text.