Cardiff-Wales Airport Ychwanegu i'r clipfwrdd A1/12 Ffeil 1988-1989 Rhan oInstitute of Welsh Affairs Records,
Cardiff-Wales Airport Ychwanegu i'r clipfwrdd R2/22 Ffeil 1990 Rhan oInstitute of Welsh Affairs Records,
David Jeffrey, Wales 2010: a Severnside International Airport: an Appreciation Study Ychwanegu i'r clipfwrdd R3/11 Ffeil 1993 Rhan oInstitute of Welsh Affairs Records,