Central New Mexico Community College. (2010). School of general education presents: Math 550 : a step by step approach to basic mathematics (11th ed.). Free Software Foundation.
Citazione stile Chigago Style (17a edizione)Central New Mexico Community College. School of General Education Presents: Math 550 : A Step by Step Approach to Basic Mathematics. 11th ed. [S.l.]: Free Software Foundation, 2010.
Citatione MLA (9a ed.)Central New Mexico Community College. School of General Education Presents: Math 550 : A Step by Step Approach to Basic Mathematics. 11th ed. Free Software Foundation, 2010.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.