Laski, Harold J., author
George Allen and Unwin, 1955
Buku Teks
Laski, Harold J., author
George Allen and Unwin, 1957
Buku Teks
Lee, Hansol H.B.
Oxford University Pres, 1989
Buku Referensi
Jespersen, Otto, author
George Allen and Unwin, 1933
Buku Teks
Jesperson, Otto
George Allen and Unwin, 1951
Buku Teks