APA (7th ed.) Citation

Charlesworth, R., & Hartup, W. W. (1967). Hartup-Charlesworth system: Observation and coding manual. [publisher not identified].

Chicago Style (17th ed.) Citation

Charlesworth, Rosalind, and Willard W. Hartup. Hartup-Charlesworth System: Observation and Coding Manual. [Place of publication not identified]: [publisher not identified], 1967.

MLA (9th ed.) Citation

Charlesworth, Rosalind, and Willard W. Hartup. Hartup-Charlesworth System: Observation and Coding Manual. [publisher not identified], 1967.