Jecker, Jon; Landy, David (August 1, 1969). "Liking a Person as a Function of Doing Him a Favour". Human Relations. 22 (4): 371–378. doi:10.1177/001872676902200407. S2CID145408235.
Jecker, Jon; Landy, David (August 1, 1969). "Liking a Person as a Function of Doing Him a Favour". Human Relations. 22 (4): 371–378. doi:10.1177/001872676902200407. S2CID145408235.