Gaya APA

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

Gaya MLA

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