APA (7th ed.) Citation

Ainsworth, M. D. S. (1969). Maternal-care variables. [publisher not identified].

Chicago Style (17th ed.) Citation

Ainsworth, Mary D. Salter. Maternal-care Variables. [Place of publication not identified]: [publisher not identified], 1969.

MLA (9th ed.) Citation

Ainsworth, Mary D. Salter. Maternal-care Variables. [publisher not identified], 1969.