Nelson, E. C. (1967). Reference Books for a Regional Reference Collection. Revised Edition.
Citazione stile Chigago Style (17a edizione)Nelson, Edward C. Reference Books for a Regional Reference Collection. Revised Edition. 1967.
Citatione MLA (9a ed.)Nelson, Edward C. Reference Books for a Regional Reference Collection. Revised Edition. 1967.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.