APA

Heere Wybo P,, . (1981). International bibliography of air law : Supplement 1977 - 1980. London: Martinus Nijhoff Publishers.

Chicago

Heere Wybo P,, . 1981. International bibliography of air law : Supplement 1977 - 1980. London: Martinus Nijhoff Publishers.

Harvard

Heere Wybo P,, . (1981). International bibliography of air law : Supplement 1977 - 1980. London: Martinus Nijhoff Publishers.

MLA

Heere Wybo P,, . International bibliography of air law : Supplement 1977 - 1980. London: Martinus Nijhoff Publishers. 1981.