Alguns dos materiais de referência do Lexikos

[AMH] American Heritage

[CAM] Cambridge Advanced Learner’s online 

[COL] Collins Cobuild Advanced Learner’s English Dictionary

[FRD] The Free Dictionary

[HOU] Dicionário eletrônico Houaiss

[DAF] Dicionário Analógico de Francisco Ferreira

[LCD] Longman Contemporary Dictionary of English

[LON] Longman Exams Dictionary

[MLU] A Dictionary of Modern Legal Usage – Brian Garner

[MWB] Merriam-Webster Online

[OXC] Oxford Collocations Dictionary for Students of English

[RIT] Roget’s International Thesaurus