APA引文

(1998). Ulrich's international periodicals directory 1998 (v.2: Classified list of subjects E-L) (36th.). R R Bowker.

Chicago Edition Citation

Ulrich's International Periodicals Directory 1998 (v.2: Classified List of Subjects E-L). 36th. New Jersey: R R Bowker, 1998.

MLA引文

Ulrich's International Periodicals Directory 1998 (v.2: Classified List of Subjects E-L). 36th. R R Bowker, 1998.