Cita APA (7a ed.)

Helson, H. (1948). Adaptation-level as a basis for a quantitative theory of frames of reference. [s.n.].

Cita Chicago Style (17a ed.)

Helson, Harry. Adaptation-level as a Basis for a Quantitative Theory of Frames of Reference. [S.l.]: [s.n.], 1948.

Cita MLA (9a ed.)

Helson, Harry. Adaptation-level as a Basis for a Quantitative Theory of Frames of Reference. [s.n.], 1948.