It is difficult : ten years

MLA

Jaar, Alfredo, Patricia C Phillips, and Rick Pirro. It Is Difficult : Ten Years. Barcelona: Actar, 1998.

APA

Jaar, A., Phillips, P. C, & Pirro, R. (1998). It is difficult : ten years. Barcelona: Actar.

Chicago

Jaar, Alfredo, Patricia C Phillips, and Rick Pirro. It Is Difficult: Ten Years. Barcelona: Actar, 1998.