Martin, R. P. (1976). A Curriculum Laboratory Classification Scheme for Elementary and Secondary School Textbooks.
Citazione stile Chigago Style (17a edizione)Martin, Rosetta P. A Curriculum Laboratory Classification Scheme for Elementary and Secondary School Textbooks. 1976.
Citatione MLA (9a ed.)Martin, Rosetta P. A Curriculum Laboratory Classification Scheme for Elementary and Secondary School Textbooks. 1976.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.