Finnegan, John D. “Crediting Options for Postsecondary Remediation: A Critical Analysis.” Peabody Journal of Education 59.1 (1981): 54–59.
Finnegan deals with the different types of credit, the confusing terminology, and what is actually earned by the student with each type of credit.
Lorimer, Margaret F. “How Much Is a Credit Hour? A Plea for Clarification.” The Journal of Higher Education 33.6 (1962): 302–306.
Though published in 1962, Lorimer discusses the timeless issues of how colleges decide how many credits to give each class.