See Allo

edited by G. N. Appell and Leigh R. Wright

Cornell University, 1978

Buku Referensi

Molnar, Andrea Katalin

KITLV Press , 2000

Buku Teks

Gallup, George, author

McGraw-Hill, 1982

Buku Teks

Robinson, Danielm, author

Lonely Publications Pty Ltd, 2011

Buku Referensi

Mackinnon, John Ramsay, author

[publisher not identified], [date of publication not identified]

Buku Teks