Παραπομπή σε μορφή APA (7η εκδ.)

North Dakota. Department of Public Instruction. (1963). A course of study and a guide for teachers of eight grade earth science (prelim ed.). Department of Public Instruction.

Παραπομπή σε μορφή Chicago (17η εκδ.)

North Dakota. Department of Public Instruction. A Course of Study and a Guide for Teachers of Eight Grade Earth Science. prelim ed. Bismarck: Department of Public Instruction, 1963.

Παραπομπή σε μορφή MLA (9th εκδ.)

North Dakota. Department of Public Instruction. A Course of Study and a Guide for Teachers of Eight Grade Earth Science. prelim ed. Department of Public Instruction, 1963.