Gaya APA

Lubis, M, S. et al (1990,2000,1993,1996,1986,1997,2005,2014,2016,2009,2015). Ilmu Negara (Ed. 3,Ed. 2,-,Revisi,I,1). Medan: Mandar Maju.

Gaya MLA

Lubis, M., Solly. et al. "Ilmu Negara". Ed. 3,Ed. 2,-,Revisi,I,1 Medan: Mandar Maju, 1990,2000,1993,1996,1986,1997,2005,2014,2016,2009,2015. Text.