Cita APA (7a ed.)

I. C. S. Reference library a series of textbooks prepared for the students of the international correspondence school and containing in permanent form the instruction papers, examination questions, and keys used in their various courses: Arithmetic, elementary algebra, mensuration, physics.

Cita Chicago Style (17a ed.)

I. C. S. Reference Library a Series of Textbooks Prepared for the Students of the International Correspondence School and Containing in Permanent Form the Instruction Papers, Examination Questions, and Keys Used in Their Various Courses: Arithmetic, Elementary Algebra, Mensuration, Physics. s.l. : Scranton International Textbook company, s.a.

Cita MLA (8a ed.)

I. C. S. Reference Library a Series of Textbooks Prepared for the Students of the International Correspondence School and Containing in Permanent Form the Instruction Papers, Examination Questions, and Keys Used in Their Various Courses: Arithmetic, Elementary Algebra, Mensuration, Physics.