YPF (Firma) (Nombre corporativo)
- YPF S.A.
Its Annual report, 1993: t.p. (YPF) p. 2 (name changed to YPF S.A. from Yacimientos PetrolÔiferos Fiscales Sociedad de Estado with privatization, completed Dec. 31, 1992)
Repsol YPF (Firm). Informe anual, 99: p. 2 (Repsol bought YPF in 1999 to form Repsol YPF)