| LC control no. | n 81100239 |
|---|---|
| Personal name heading | Grzelak, Janusz |
| Found in | Cooperation and helping behavior, 1981 (a.e.) t.p. (Janusz Grzelak; prof., Institute of Psychology, Univ. of Warsaw) His Konflikt interesów, 1978: t.p. (Janusz Ł. Grzelak) |
| Invalid LCCN | n 81122415 |
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