Gruber, Edward
Two thousand tree hundred (2300) steps to word power; programmed learning without a machine. Book design / by Fred Honig.
Arc Books, 1963
 Buku Teks
Mathews, M. M.
Words : how to know them / M. M. Mathews
Henry Holt, 1956
 Buku Teks
Rima Andriani Sari
Komponen kosa kata dalam pengajaran bahasa Inggris di Sekolah Dasar : Sebuah analisis terhadap buku ajar
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2004
 UI - Tesis Membership
Read, John
Assessing vocabulary
Cambridge University Press, 2000
 Buku Teks
Coon, Horace
Speak better write better English : what you can do with words; what words can do for you / Horace Coon
A Signet Key Book, 1954
 Buku Teks SO