MacDonald, G. (1948). Spanish-English and English-Spanish commercial dictionary: A comprehensive vocabulary of words and expressions current in the English and Spanish languages, and more particularly of those used in commercial correspondence, as well as technical and engineering terms, etc. (Fifth edition revised and enlarged.). London: Sire Isaac Pitman & Sons, Ltd..

MacDonald, G.R. Spanish-English and English-Spanish Commercial Dictionary: A Comprehensive Vocabulary of Words and Expressions Current in the English and Spanish Languages, and More Particularly of Those Used in Commercial Correspondence, As Well As Technical and Engineering Terms, Etc. Fifth edition revised and enlarged. London: Sire Isaac Pitman & Sons, Ltd., 1948.

MacDonald, G.R. Spanish-English and English-Spanish Commercial Dictionary: A Comprehensive Vocabulary of Words and Expressions Current in the English and Spanish Languages, and More Particularly of Those Used in Commercial Correspondence, As Well As Technical and Engineering Terms, Etc. Fifth edition revised and enlarged. London: Sire Isaac Pitman & Sons, Ltd., 1948.