Cita APA (7a ed.)

I. C. S. reference library: A series of textbooks prepared for the students of the international correspondence schools and containing in permanent form the instruction papers, examination questions, and keys used in their various courses.

Cita Chicago Style (17a ed.)

I. C. S. Reference Library: A Series of Textbooks Prepared for the Students of the International Correspondence Schools and Containing in Permanent Form the Instruction Papers, Examination Questions, and Keys Used in Their Various Courses. s.l.

Cita MLA (8a ed.)

I. C. S. Reference Library: A Series of Textbooks Prepared for the Students of the International Correspondence Schools and Containing in Permanent Form the Instruction Papers, Examination Questions, and Keys Used in Their Various Courses.