Cita APA (7th ed.)

SPSS Inc., Marketing Department. (1988). SPSS /PC+ v2.0 Base manual: For the IBM PC/XT/AT and PS/2. SPSS Inc.

Cita Chicago (17th ed.)

SPSS Inc., Marketing Department. SPSS /PC+ V2.0 Base Manual: For the IBM PC/XT/AT and PS/2. USA: SPSS Inc, 1988.

Cita MLA (9th ed.)

SPSS Inc., Marketing Department. SPSS /PC+ V2.0 Base Manual: For the IBM PC/XT/AT and PS/2. SPSS Inc, 1988.