APA

National Education Association of the United States, . (1970). The assistant principalship in public elementary schools--1969: a research study. [Washington]: National Association of Elementary School Principals.

Chicago

National Education Association of the United States, . 1970. The assistant principalship in public elementary schools--1969: a research study. [Washington]: National Association of Elementary School Principals.

Harvard

National Education Association of the United States, . (1970). The assistant principalship in public elementary schools--1969: a research study. [Washington]: National Association of Elementary School Principals.

MLA

National Education Association of the United States, . The assistant principalship in public elementary schools--1969: a research study. [Washington]: National Association of Elementary School Principals. 1970.