edited by Janet l. Nicol
Blackwell , 2006
Buku Teks
Zico Juniar Abdi
Fakultas Psikologi Universitas Indonesia, 2017
UI - Skripsi (Membership)
edited by Michael Tomasello
Lawrence Erlbaum Associates, 2003
Buku Teks
edited by Howard Giles and W. Peter Robinson
John Wiley & Sons, 1990
Buku Referensi
Devito, Joseph A.
Random House, 1970
Buku Teks