What has the author R David Paul Zorc written?

R. David Paul Zorc has written:

'Sotho newspaper reader, reference grammar, and lexicon' -- subject(s): Sotho language, Readers, Grammar, Dictionaries, English

'Core etymological dictionary of Filipino' -- subject(s): Etymology, Dictionaries, Tagalog language

'Tagalog slang dictionary' -- subject(s): Dictionaries, Tagalog language, Slang, English