Guevara, S. (1959). Bar examination questions and answers in commercial law, from 1946 to 1958 (4th ed.). Rex Book Store.
Chicago-referens (17:e uppl.)Guevara, Sulpicio. Bar Examination Questions and Answers in Commercial Law, from 1946 to 1958. 4th ed. Manila: Rex Book Store, 1959.
MLA-referens (9:e uppl.)Guevara, Sulpicio. Bar Examination Questions and Answers in Commercial Law, from 1946 to 1958. 4th ed. Rex Book Store, 1959.
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