Sterling, Mary Jane, author.

Heaton, J., author.

Harding, James, editor.

Independent Institute of Education.

Masterskill.

Independent Institute of Education.

Gravetter, Frederick J., author. (uri) http://id.loc.gov/authorities/names/n84044621 (uri) http://viaf.org/viaf/sourceID/LC 84044621 (uri) /resolver/wikidata/lc/n84044621

White, R. D. (Robert Douglas), 1956- author.

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Sonnekus, J. C., author.

Cottrell, Stella, author.