Gaya APA

Fox, L., Swanson, C, P. (NULL). Perpectives an intermediate reader . San: San Diego: Harcourt Brace Jovanovich; 1980.

Gaya MLA

Fox, Len., Swanson, Carl, P.. "Perpectives an intermediate reader". San: San Diego: Harcourt Brace Jovanovich; 1980, NULL. Text.