APA-ийн эшлэл(7 дахь хэвлэлт)
Cap, F. (1971). Averaging Method for the solution of non-linear differential equations with periodic nonharmonic solutions. Goddard Space Flight Center.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)
Cap, Ferdinand. Averaging Method for the Solution of Non-linear Differential Equations with Periodic Nonharmonic Solutions. Greenbelt, Maryland: Goddard Space Flight Center, 1971.
MLA -ийн эшлэл (9 дэх хэвлэлт)
Cap, Ferdinand. Averaging Method for the Solution of Non-linear Differential Equations with Periodic Nonharmonic Solutions. Goddard Space Flight Center, 1971.
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